KR101418883B1 - Calculating system for starting resistance of vehicle battery and method therefor - Google Patents

Abstract

The purpose of the present invention is to provide a system and a method thereof for calculating voltage and current change rates upon starting a vehicle battery up to measurable limits of a low current measurement band sensor using the low current measurement band sensor, and continuously cumulating and calculating starting resistance within the limits from the calculated voltage and current change rates. To achieve this purpose, the system of the present invention includes: a voltage change rate calculating unit which calculates a voltage change value within limits of a low current measurement band sensor, and calculates a voltage change rate per hour using the calculated voltage change value and the time required; a current change rate calculating unit which calculates a current change value within the limits of the low current measurement band sensor, and calculates a current change rate per hour using the calculated current change value and the time required; and a starting resistance calculating unit which calculates starting resistance using the voltage and current change rates per hour respectively calculated by the voltage change rate calculating unit and the current change rate calculating unit, and calculates a cumulative average by cumulatively operating starting resistance continuously calculated for a predetermined period of time.

Description

TECHNICAL FIELD [0001] The present invention relates to a starting resistance calculation system for a vehicle battery,

The present invention relates to a system and method for calculating starting resistance of a vehicle battery, and more particularly, to a system and method for calculating starting resistance of a vehicle battery, The present invention relates to a system and a method for calculating a starting current to be supplied to a battery at the next start by continuously accumulating and calculating a starting resistance within a limit range from a current change rate.

 In an internal combustion engine vehicle equipped with a battery sensor (BS) or an intelligent battery sensor (IBS), the minimum voltage is calculated in real time during the start of the battery in order to secure the starting performance of the vehicle. It is very important to accurately measure the starting current supplied from the battery at startup.

Regarding the starting current of the vehicle battery, many applications and disclosures have been made in addition to Korean Patent Laid-Open No. 10-2012-0053615 (hereinafter referred to as "prior art"). The above-mentioned prior art document describes a configuration for outputting a starting current.

Most current systems, including the preceding literature, use a current sensor having a current measurement range of 1000 A or more for estimation of the starting current or a fixed value.

However, the current sensor capable of measuring a large current is relatively expensive. When the starting current is used as a fixed value, it does not reflect the change in the starting current due to aging and system abnormality, and a measurement error occurs in the low current band .

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide a low current measurement band sensor, The present invention provides a system and method for continuously calculating a starting resistance within a limit range from a voltage and current change rate.

According to an aspect of the present invention, there is provided a starter resistance calculation system for a vehicle battery, comprising: a voltage detection unit that calculates a voltage change value within a limit range of a low current measurement band sensor, A voltage change rate calculating unit for calculating a rate of change; A current change rate calculation unit for calculating a current change value within a limit range of the low current measurement band sensor and calculating a current change rate per unit time using the calculated current change value and the required time; Calculating a starting resistance by using the voltage and current change rate per unit time calculated through the voltage change rate calculating unit and the current change rate calculating unit, calculating a starting resistance by cumulatively calculating a starting resistance continuously calculated for a predetermined time, part; .

According to another aspect of the present invention, there is provided a method of calculating a starting resistance of a vehicle battery, comprising the steps of: (a) calculating a voltage change value within a limit range of a low current measurement band sensor by a voltage change rate calculating section, Calculating a voltage change rate per unit time; (b) calculating a current change value within a limit range of the current change rate calculating section of the low current measuring band sensor, calculating a current change rate per hour using the calculated current change value and the required time; And (c) the starting resistance calculation unit calculates the starting resistance using the voltage and current change rates per hour calculated through the steps (a) and (b), and accumulates the starting resistance, A process of calculating an average; .

According to the present invention as described above, the starting current discharged from the battery can be calculated by calculating the starting resistance of the battery at startup using the low current measuring band sensor having a low current measuring range, There is an effect that can be used to calculate the State of Charge (SOC) and the State of Function (SOF).

According to the present invention, by using a low current measurement band sensor such as a level of 200 A or less, a small measurement error and noise stiffness can be obtained in a current range of ± 50 A or less where the battery is mainly operated. to Digital Converter) resolution is higher than that of a sensor with a current measurement range of 1000 A or more. Accordingly, the accumulation error due to battery AH (Ampere Hour) counting can be reduced in the calculation of the state of charge (SOC) of the battery.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall configuration conceptually showing a starting resistance calculation system for a vehicle battery according to the present invention; FIG.
2 is a diagram showing an example of a voltage change at startup according to the present invention.
3 is a diagram illustrating an example of a change in current during startup according to the present invention.
4 is a whole flowchart of a method of calculating a starting resistance of a vehicle battery according to the present invention.

Specific features and advantages of the present invention will become more apparent from the following detailed description based on the accompanying drawings. It is to be noted that the detailed description of known functions and constructions related to the present invention is omitted when it is determined that the gist of the present invention may be unnecessarily blurred.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail with reference to the accompanying drawings.

A starting resistance calculation system for a vehicle battery according to the present invention will now be described with reference to FIGS. 1 to 3. FIG.

In an internal combustion engine vehicle equipped with a battery sensor (BS) or an intelligent battery sensor (IBS), a minimum voltage is calculated in real time at the start of the battery to secure the starting performance of the vehicle. For this lowest voltage calculation, the starting current measurement is a very important factor.

The system according to the present invention is preferably understood to be a system for continuously calculating a starting resistance within a limit range from a voltage and current change rate to calculate a starting current to be supplied to the battery at the next start. At this time, the low current measurement band sensor may be a band of 1A to 200A, preferably 200A or less.

FIG. 1 is an overall configuration diagram conceptually showing a starting resistance calculation system S for a vehicle battery according to the present invention, and FIGS. 2 and 3 are examples for showing changes in voltage and current at start-up.

1, the starting resistance calculation system S for a vehicle battery according to the present invention includes a voltage change rate calculation unit 100, a current change rate calculation unit 200, a starting resistance calculation unit 300, And a calculation unit 400.

The voltage change rate calculation unit 100 calculates the voltage change value within the limit range of the low current measurement band sensor and calculates the voltage change rate per unit time using the calculated voltage change value and the required time. The voltage change value calculation module 110 and the voltage change rate per unit time calculation module 120 as shown in FIG.

Specifically, the voltage change value calculation module 110 calculates the voltage change value V ₂ (V ₂ ) at a time point (T ₂ ) at which the current value reaches the measurable limit range of the low current measurement band sensor 10, ) And a measured voltage (V ₁ ) at a starting time (T ₁ ) at which the start of current supply for starting is started, within the limit range (ΔV ₁₂ ).

[Equation 1]

V ₁₂ = V ₂ - V ₁

The voltage change rate per unit time calculation module 120 calculates the voltage change rate ΔV ₁₂ within the limit range calculated through the voltage change value calculation module 110 and the required time ΔT , The voltage change rate per unit time (K _V ) is calculated.

[Equation 2]

K _V = DELTA V _{12 /} DELTA T = (V ₂ - V ₁ ) / (T ₂ - T ₁ )

The current change rate calculation unit 200 calculates the current change value within the limit range of the low current measurement band sensor and calculates the current change rate per hour using the calculated current change value and the required time. The current change value calculating module 210 and the current change rate per unit time calculating module 220 as shown in FIG.

Specifically, the current change value calculation module 210 calculates the current change value I ₂ (T ₂ ) at the time (T ₂ ) at which the current value reaches the measurable limit range of the low current measurement band sensor 10, ) and, as a difference between the measured current (I ₁₎ at the start time (T _1), and calculates the threshold value range within the current change (△ I _12).

[Equation 3]

I ₁₂ = I ₂ - I ₁

The current-to-current-rate-of-change calculating module 220 calculates the current-variation rate per unit time ΔΔ ₁₂ within the limit range calculated through the current-variation-value calculating module 210 and the required time ΔT As a ratio, the current change rate per unit time K _I is calculated.

[Equation 4]

K _I = ΔI ₁₂ ÷ ΔT = (I ₂ - I ₁ ) / (T ₂ - T ₁ )

The starting resistance calculating unit 300 calculates the starting resistance by using the voltage-to-current ratio and the rate of change of current calculated through the voltage change rate calculating unit 100 and the current change rate calculating unit 200, The starting resistance calculation module 310 and the cumulative average calculation module 320 perform the function of calculating the cumulative average by cumulatively calculating the starting resistance.

Specifically, the start-up resistance calculation module 310 calculates the start-up resistance using the voltage change rate per unit time and the current change rate calculated through the voltage change rate calculation unit 100 and the current change rate calculation unit 200, The starting resistance R _C of the vehicle battery is calculated as the ratio between the voltage change rate per unit time K _V and the current change rate K _I.

[Equation 5]

R _C = K _V ÷ K _I

The cumulative average calculation module 320 calculates the starting resistance R _{C_1} + R _{C_2} + ... + R _{C_n} continuously calculated for a predetermined time through the starting resistance calculation module 310 as an accumulation operation And calculates the cumulative average of the starting resistance R _{C_AVG} as a ratio of the cumulative value (Σ R _C ) to the cumulative number (n), as shown in [Equation 7].

[Equation 6]

_{Σ R C = R C_1 + R} C_2 + · · · + R C_n

[Equation 7]

R _{C _ AVG} = Σ R _C ÷ n

Starting current calculation section 400, cumulative average (R _{C_AVG)} and measured voltage (V on the lowest voltage (V ₃₎ and start-up time (T ₁₎ of the calculated starting resistance through the starting resistance calculating section 300, ₁ ), the starting current I _C is calculated.

[Equation 8]

I _C = (V ₃ - V ₁ ) / R _{C _ AVG}

The starting current I _C can be used to calculate the state of charge (SOC) and the state-of-function (SOF) of the battery at the next starting time. At this time, it is desirable to perform fast sampling and calculation that can accurately measure voltage and current values within a short startup period.

Hereinafter, a method of calculating the starting resistance of a vehicle battery using the system S will be described with reference to FIG.

4, the voltage change value calculation module 110 of the voltage change rate calculation unit 100 calculates the starting resistance of the vehicle battery according to the present invention, as the difference between the point in time (T ₂₎ the measured voltage (V ₂₎ and, measuring the voltage at the start-up at the beginning of the current supply for starting (T ₁₎ (V ₁₎ in which the current value reaches a measurable limit range , and limits calculated in the voltage change value (△ V ₁₂₎ and (S10), calculated per voltage change rate module 120 is the limit range the voltage change value calculated through the step S10 (△ V _12), Duration as the ratio of the (△ T), and calculates the voltage change rate per hour (K _V) (S20).

Then, the measured current in the current change rate calculating section calculates the current change value of 200, the module 210 is the point when the current value reaches a measurable limit of a low-current measurement range sensor _{(10) (T 2) (} I 2 And the measured current I ₁ at the starting point of time T ₁ is calculated as the current variation value ΔI ₁₂ within the limit range S 30, The current change rate K _I per unit time is calculated as a ratio of the current change value I I ₁₂ within the limit range calculated through the step S ₁₀ and the required time ΔT at step S 40.

Subsequently, the starting resistance calculation module 310 of the starting resistance calculation unit 300 calculates the starting resistance R _C of the vehicle battery as a ratio between the calculated voltage change rate per unit time K _V and the current change rate K _I and (S50), a cumulative average calculation module 320, and a cumulative operation (S60), the cumulative operation values for start-up resistor (R + R _{C_1 C_2} + ·· + R _{C_n)} is calculated continuously for a predetermined time (Σ R The cumulative average of the starting resistance R _{C_AVG} is calculated as the ratio of the cumulative number of _{revolutions C} to the cumulative number n.

And, the starting current calculating unit 400 is the cumulative average of the calculated starting resistance through the S70 step (R _{C_AVG)} and a minimum voltage (V ₃₎ and the measured voltage at the start time (T ₁₎ (V ₁₎ The starting current I _C is calculated as the ratio of the vehicle to the vehicle (S80).

As described above, the starting resistance calculation system and method of a vehicle battery according to the present invention as described above can be applied to a vehicle having a current sensor having a relatively large current measuring range by using a current sensor having a low current band in calculation of starting resistance It is possible to reduce the problem of measurement error in the low current band and achieve a low cost.

While the present invention has been particularly shown and described with reference to preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. It will be appreciated by those skilled in the art that numerous changes and modifications may be made without departing from the invention. Accordingly, all such appropriate modifications and changes, and equivalents thereof, should be regarded as within the scope of the present invention.

S: Starting resistance calculation system of vehicle battery
100: voltage change rate calculating unit 200: current change rate calculating unit
300: starting resistance calculating section 400: starting current calculating section
110: voltage change value calculation module 120: voltage change rate calculation module
210: current change value calculation module 220: current change rate calculation module
310: Starting resistance calculation module 320: Cumulative average calculation module

Claims (10)

A voltage change rate calculating unit (100) for calculating a voltage change value within a limit range of the low current measurement band sensor, and calculating a voltage change rate per unit time by using the calculated voltage change value and the required time;
A current change rate calculating unit (200) for calculating a current change value within a limit range of the low current measurement band sensor, and calculating a current change rate per unit time by using the calculated current change value and the required time; And
The starting resistance is calculated using the voltage and current change rate per unit time calculated through the voltage change rate calculating unit 100 and the current change rate calculating unit 200. The cumulative average of the starting resistance, A starting resistance calculation unit 300 for calculating a starting resistance value; The starting resistance calculation system of the vehicle battery.
The method according to claim 1,
The voltage change rate calculation unit 100 calculates,
The measured voltage V ₂ at the time point T ₂ at which the current value reaches the measurable limit range of the low current measuring band sensor and the measured voltage V ₂ at the starting time point T ₁ at which the current supply for starting is started ₁₎ as a difference between the voltage change value calculation module 110 for calculating a limit value within the range of voltage change (△ V _12); And
As the ratio of the limit range the voltage change value (△ V ₁₂₎ and a time (△ T) calculated by the calculating the voltage change value module 110, a per voltage change rate calculating a per voltage change rate (K _V) A calculation module 120; Wherein the starting resistance calculation system calculates the starting resistance of the vehicle battery.
The method according to claim 1,
The current change rate calculation unit 200 calculates a current change rate
As the difference between the measured current (I ₁₎ at the point when the current value reaches a measurable limit of a low-current measurement range sensor (T ₂₎ measuring the current in the (I _2), and a start time (T _1), limits A current change value calculation module 210 for calculating an in-range current change value? I ₁₂ ; And
The current change rate per unit time KI for calculating the current change rate K _I per unit time is calculated as the ratio of the current variation value? I ₁₂ within the limit range calculated through the current variation value calculation module 210 to the required time? T, A calculation module 220; Wherein the starting resistance calculation system calculates the starting resistance of the vehicle battery.
The method according to claim 1,
The starting resistance calculating section 300 calculates the starting resistance
The starting resistance R _C of the vehicle battery is set as a ratio of the voltage change rate K _V per hour and the current change rate K _I calculated through the voltage change rate calculating unit 100 and the current change rate calculating unit 200, A starting resistance calculation module 310 for calculating the starting resistance; And
The start-up resistance calculated cumulative operation for a predetermined time continuously starting resistance (R + R _{C_1 C_2} + ·· + R _{C_n)} calculated during the through module 310, and the cumulative calculated value (Σ _C R) and the cumulative number ( n), a cumulative average calculation module (320) for calculating a cumulative average of the starting resistance (R C - _AVG ); Wherein the starting resistance calculation system calculates the starting resistance of the vehicle battery.
The method according to claim 1,
The ratio of the cumulative average of the starting resistance R _{C_AVG} calculated through the starting resistance calculation unit 300 to the _difference between the lowest voltage V ₃ and the measured voltage V ₁ at the starting point T ₁ A starting current calculation unit 400 for calculating a starting current I _C ; The starting resistance calculation system of the vehicle battery.
(a) calculating a rate of change of voltage in the limit range of the low current measurement band sensor by the voltage change rate calculation unit 100, and calculating a rate of voltage change per time using the calculated voltage change value and the required time;
(b) calculating a current change value within a limit range of the low current measurement band sensor by the current change rate calculation unit 200, and calculating a current change rate per unit time using the calculated current change value and the required time; And
(c) The starting resistance calculating unit 300 calculates the starting resistance using the voltage and current change rates per hour calculated through the steps (a) and (b), and calculates the starting resistance continuously Calculating a cumulative average; And calculating a starting resistance of the vehicle battery.
The method according to claim 6,
In the step (a)
(a-1) the voltage change rate calculating section 100, the measured voltage at the time (T ₂₎ that the current value reaches a measurable limit of a low-current measurement range sensor (V ₂₎ and a current supply for starting as the difference between the measured voltage (V ₁₎ at the start time (T ₁₎ starting the step of calculating the limit range the voltage change value (△ V _12); And
(a-2), per hour, a ratio of the voltage change rate calculating unit 100 is the (a-1) the limit range the voltage change value is calculated through the steps (△ V ₁₂₎ and a time (△ T) Calculating a voltage change rate (K _V ); And determining a starting resistance of the battery.
The method according to claim 6,
The step (b)
(b-1) said current change rate calculating section 200, the measured current (I ₂₎ at the time (T ₂₎ that the current value reaches a measurable limit of a low-current measurement range sensor, and a start time (T ₁ ) as a difference between the measured current (I ₁₎ in the step of calculating a threshold value range within the current change (△ I _12); And
(b-2) per hour, a ratio of said current change rate calculating section 200, the above (b-1) the threshold range within the current change value is calculated through the steps (△ I ₁₂₎ and a time (△ T), Calculating a current change rate (K _I ); And determining a starting resistance of the battery.
The method according to claim 6,
The step (c)
(c-1) calculating a starting resistance (R _C ) of the vehicle battery as a ratio of the voltage change rate (K _V ) per unit time and the current change rate (K _I ) calculated by the starting resistance calculating section (300);
(c-2) accumulating the starting resistance ( _{Rc_1} + _Rc2 + _{Rc_n} ) continuously calculated by the starting resistance calculating unit 300 for a predetermined time; And
(c-3) calculating a cumulative average of the starting resistance (R C - _AVG ) as a ratio between the cumulative value (? R _C ) and the cumulative number (n) of the starting resistance calculation unit (300); And determining a starting resistance of the battery.
The method according to claim 6,
After the step (c)
(d) measuring the voltage at the start-up current calculation section 400, a (c) the cumulative average of the calculated starting resistance through the process (R _{C _ AVG)} and a minimum voltage (V ₃₎ and start-up time (T ₁₎ Calculating a starting current (I _C ) as a ratio of a difference between a start-up current (V ₁ ) And calculating a starting resistance of the vehicle battery.

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