KR101967303B1 - Method for reducing errors of solenoid control and mcu for reducing errors of solenoid control - Google Patents

Abstract

A method for reducing the error of solenoid control according to an embodiment of the present invention is a method for reducing an error of a solenoid control in which an MCU receives a current value A1 at a first time and outputs a current value A1 at a first time T (where T is a control period of a solenoid) Calculating a representative resistance value (Radap) of the coil of the solenoid by using the target voltage value (V0), calculating an estimated resistance value (Radap) of the solenoid coil at the first time using the calculated representative resistance value Calculating a target voltage value (V1) at the first time using the predicted resistance value at the first time calculated by the MCU and the target current value (I1) at the first time, Estimating a correction value (Duty) for error reduction using the target voltage value at the first time calculated by the MCU and the current battery voltage value (Vbatt), and calculating a correction value Applying a correction value for error reduction .

Description

METHOD FOR REDUCING ERRORS OF SOLENOID CONTROL AND MCU FOR REDUCING ERRORS OF SOLENOID CONTROL BACKGROUND OF THE INVENTION [0001]

The present invention relates to an error reduction method for a solenoid control and an MCU for reducing a control error. More specifically, in order to solve the problem of the conventional solenoid control in which the resistance value changes according to the temperature, a control error is generated. In order to solve the problem of the conventional solenoid control, a correction value calculated through learning for a predetermined period is applied to the solenoid control, Reduction method and an MCU.

Solenoid control and variable solenoid control (VFS) are applied in various industrial fields, and conventional solenoid control is based on control of voltage and controls the current generated accordingly .

Such a solenoid is made up of a coil, and it is generally not attached to an independent configuration but is attached to other equipment or the like. In this case, when other instruments or the like actively act, heat is generated due to the heat generated thereby, and the solenoid made of the coil is also influenced by the temperature rise. Specifically, the resistance value of the coil changes due to the influence of the temperature rise, which makes it difficult to accurately control the solenoid.

On the other hand, if the mechanism to which the solenoid is attached is a transmission, the solenoid is affected by the oil temperature of the transmission. Specifically, as the shift is performed, the oil temperature of the transmission increases, so that the resistance value of the solenoid coil attached to the transmission is changed according to the oil temperature. In this case, there is a problem that a control error occurs in the solenoid control, and when a control error occurs in the solenoid control of a drive system such as a transmission, there is a problem that a serious accident may occur. And MCU for control error reduction are required.

Korean Registered Patent No. 10-1646457 (2016.08.01)

An object of the present invention is to provide a solenoid control error reduction method and an MCU for reducing a control error which can reduce a control error of a solenoid control according to a temperature.

The technical problems of the present invention are not limited to the above-mentioned technical problems, and other technical problems which are not mentioned can be clearly understood by those skilled in the art from the following description.

According to an aspect of the present invention, there is provided a method of reducing an error in a solenoid control, the method comprising: receiving a current value (A1) at a first time, Calculating a representative resistance value (Radap) of the coil of the solenoid by using the target voltage value (V0) in the control period of the solenoid Calculating a predicted resistance value (R1) of the solenoid coil by using the estimated resistance value at the first time calculated by the MCU and the target current value (I1) at the first time, Calculating a target voltage value (V1) of the battery voltage (V1), calculating a correction value (Duty) for error reduction using the target voltage value at the first time calculated by the MCU and the current battery voltage value And the MCU calculates the estimated Oh And applying a correction value for decreasing the difference.

According to an embodiment, the current value A1 at the first time may be a current value after the current generated by the target voltage value V0 at the first-T time is stabilized.

According to an embodiment, the step of calculating the predicted resistance value (R1) of the solenoid coil at the first time may be performed by the MCU using the following equation (1).

R1 = Radap * (1 + alpha * (T1 - Tadap))

Where T1 is the temperature of the transmission fluid at the first time, Tadap is the temperature of the transmission fluid at the first-T time,

According to one embodiment, the step of calculating the target voltage value (V1) at the first time may be performed by the MCU using the following equation (2).

Equation 2: V1 = I1 * R1 + Koffset

(Where Koffset is a constant for offset correction occurring in a voltage-current relationship)

According to an embodiment, the step of calculating the correction value (Duty) for reducing the error may be performed by the MCU using the following equation (3).

Equation 3: Duty = V1 / Vbatt

(Where Vbatt is the voltage of the current battery)

According to one embodiment, the control period T of the solenoid may be 10 ms.

According to an embodiment of the present invention, when a change in the transmission oil temperature exceeding a predetermined range is detected after applying the correction value for decreasing the error, the MCU calculates a change- Setting the time at which the change is sensed to a new first time, and the MCU can re-execute the error reduction method of the solenoid control.

According to another aspect of the present invention, there is provided an MCU for reducing an error of a solenoid control, the MCU comprising: A representative resistance value calculating section for calculating a representative resistance value (Radap) of the coil of the solenoid by using the target voltage value (V0) in the control period of the solenoid A predicted resistance value calculating section for calculating a predicted resistance value R1 of the solenoid coil at a first time, a predicted resistance value calculating section for calculating a predicted resistance value at a first time calculated by the predicted resistance value calculating section, A target voltage value calculation unit for calculating a target voltage value (V1) at the first time using the target voltage value calculation unit (I1) and a target voltage value calculation unit for calculating a target voltage value at a first time calculated by the target voltage value calculation unit and a current battery voltage value ) And by comprising a compensation value calculation for calculating a correction value (Duty) for the error reduction.

According to the present invention as described above, since the correction value calculated through learning for a predetermined period is applied to the solenoid control, the control error of the solenoid control according to the temperature can be reduced.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood to those of ordinary skill in the art from the following description.

FIG. 1 is a flowchart illustrating a method of reducing an error of a solenoid control according to an embodiment of the present invention.
2 is a graph showing current values at the first time and the first time.
3 is a graph showing voltage values at the first time and the first-T time.
4 is a graph showing the oil temperature of the transmission at the first time and the first-T time.
5 is a graph showing a graph of correcting a voltage value through a correction value Duty for reducing an error.
FIG. 6 is a graph showing the correction of the voltage value according to FIG. 5 and the correction of the current value.
FIG. 7 is a flowchart illustrating a process performed when a change in a transmission oil temperature exceeding a predetermined range is detected after applying a correction value for error reduction.
FIG. 8 is a diagram showing the overall configuration of an MCU for solenoid control error reduction according to another embodiment of the present invention. Referring to FIG.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

Unless defined otherwise, all terms (including technical and scientific terms) used herein may be used in a sense commonly understood by one of ordinary skill in the art to which this invention belongs. Also, commonly used predefined terms are not ideally or excessively interpreted unless explicitly defined otherwise. The terminology used herein is for the purpose of illustrating embodiments and is not intended to be limiting of the present invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification.

It is noted that the terms "comprises" and / or "comprising" used in the specification are intended to be inclusive in a manner similar to the components, steps, operations, and / Or additions.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

FIG. 1 is a flowchart illustrating a method of reducing an error of a solenoid control according to an embodiment of the present invention. However, it should be understood that the present invention is not limited to the above-described embodiments, and various changes and modifications may be made without departing from the scope of the present invention.

Each step to be described below is performed by the MCU (Micro Control Unit) 100 of the vehicle, and the change of the resistance according to the temperature of the solenoid coil should be set and analyzed based on a certain premise. First, the premise will be described.

The first premise is that at the same temperature condition, the resistance of the coil linearly increases with length. For example, when the wire resistance factor of the AWG22 coil with a cross-sectional area of 0.326 mm ² and an allowable current of 3.0 A is 0.053 Ω / m, the wire resistances when the coil is 3 m and 5 m are 3 m * 0.053 Ω / m = 0.159 Ω, 5m * 0.053Ω / m = 0.265Ω, which is about 0.1Ω difference.

The second premise is that the resistance of the coil increases linearly with temperature. For example, when the temperature resistance coefficient of the copper wire is 0.00393 / 占 폚, the difference in resistance between -30 占 폚 and 130 占 폚 is calculated to be 0.16? * (1 + 0.00393 / 0.13 Ω and 0.16 Ω * (1 + 0.00393 / ° C * (130 ° C - 25 ° C)) ≒ 0.23 Ω.

The third premise is that the solenoid variable valve uses the copper wire enameled wire and therefore behaves like a normal coil. Therefore, when the first and second premises are applied in the same manner, the deviation between the solenoid variable valves is ± 0.2Ω and the deviation with temperature is about 0.7 Ω.

In summary, the change in resistance caused by the coil is 0.1 to 0.2 Ω at the maximum, and the change in resistance that can be caused by the solenoid variable valve is 0.7 to 0.9 Ω at the maximum. In this case, since the change in resistance due to the coil length or temperature is small as a deviation between solenoid variable valves, it is sufficient to consider only the resistance between the valve and the temperature change in correct solenoid control.

Hereinafter, a method of reducing an error of solenoid control according to an embodiment of the present invention will be described from step S210 on the basis of the above-described premise.

First, the MCU 100 receives the current value A1 at the first time and calculates the representative resistance value Radap of the solenoid coil using the target voltage value V0 at the first-T time (S210).

Where T is the control period of the solenoid, typically 10 ms, but is fluidically adjustable. Also, the first time may be an arbitrary time, but the current value A1 measured at the first time is a current value after the current generated by the target voltage value V0 at the first-T time is stabilized Therefore, it is preferable that the first time or the first time is a time when a predetermined time has elapsed after the start of the vehicle. This is because a certain period of time is required from when the vehicle starts to be started until the current stabilizes.

2 and 3 are graphs showing the current value and the target voltage value at the first time and the first-T time, respectively. First, it can be confirmed that the current value is steadily increased from the first-T time toward the first time, and stabilized to A1 from the first time. Which is related to the target voltage value V0 at the first-T time. The current value is generated and stabilized as the target voltage value V0 is injected in the first-T time, and the time required for generation and stabilization is the control period T of the solenoid.

The representative resistance value (Radap) of the solenoid coil can be calculated by the Ohm's law, specifically, it can be calculated through Radap = V0 / A1. The representative resistance value (Radap) of the solenoid coil calculated here can be regarded as a representative resistance value calculated by a kind of learning. Since V0 is the target voltage value at the first-T time and A1 is the current value stabilized at the first time after the control period T of the solenoid has elapsed from the first-T time, the first-T time And elements at the first time are all considered.

  On the other hand, the current value A1 at the first time is input to the ADC 100 of the MCU 100 to confirm the actual output current value. The target voltage value V0 at the first-T time is a kind of duty, It is a predetermined value inputted by the user into the MCU 100 logic. That is, in any case, the MCU 100 plays a role of reading these values.

If the representative resistance value (Radap) of the solenoid coil is calculated, the MCU 100 calculates a predicted resistance value R1 of the solenoid coil at the first time using the calculated representative resistance value (Radap) (S220) .

Specifically, it is calculated through the following expression (1).

R1 = Radap * (1 + alpha * (T1 - Tadap))

Where T is the temperature of the oil at the first time, and Tadap is the temperature of the oil at the first-T time.

4 is a graph showing the oil temperature of the transmission at the first time and the first-T time. In this case, the oil temperature at the first time is T1, the oil temperature at the first-T time is Tadap, the oil temperature T1 at the first time is higher than the oil temperature Tadap at the first-T time, It can be predicted that the temperature of the oil has increased by driving the transmission during the control period T of the solenoid coil T, thereby changing the resistance value of the solenoid coil. Therefore, in the subsequent control step, the change of the resistance value due to the temperature difference should be handled together.

Accordingly, it can be confirmed that the difference in oil temperature between the first time and the first-T time is considered together with the temperature resistance coefficient of the solenoid coil, and R1 is the resistance of the solenoid coil calculated in the previous step Is a predicted resistance value of the solenoid coil at the first time calculated based on the value (Radap), and is not an accurate resistance value at the actual first time. However, since the representative resistance value (Radap) of the solenoid coil calculated in the previous step is a representative resistance value calculated by learning during the control period T, and the difference between the oil temperature at the first time and the first-T time is considered, Which can be regarded as a resistance value that can be accurately measured.

On the other hand, the temperature resistance coefficient a of the solenoid coil will be 0.00393 / [deg.] C when the solenoid coil is a copper wire as described above, and the temperatures T1 and Tadap at the first time and the first- Sensor and the like, and is input to the MCU 100. [0033] FIG.

If the estimated resistance value R1 of the solenoid coil at the first time is calculated, the MCU 100 calculates the predicted resistance value R1 of the solenoid coil by using the predicted resistance value R1 at the first time and the target current value I1 after the first time The target voltage value V1 after 1 hour is calculated (S230).

Specifically, it is calculated through the following expression (2).

Equation 2: V1 = I1 * R1 + Koffset

Here, Koffset is a constant for offset value correction occurring in the voltage-current relationship, and may be different depending on the solenoid control system installed in the vehicle, and may be zero. The target current value I1 after the first time is a value obtained by replacing the command value Duty received from the MCU 100 by the solenoid driver IC with a current target.

On the other hand, the target voltage value V1 at the first time may be a predetermined value input by the user to the MCU 100 logic like the target voltage value V0 at the first-T time, In order to consider the change of the resistance value according to the second embodiment. Accordingly, the initial predetermined value may be calculated and input through the above process. However, since the temperature of the transmission oil will be different each time depending on the driving state of the transmission, there is no great advantage since it can not be accurately reflected in advance.

In summary, it suffices that only the target voltage value V0 in the first-T time is sufficient, and in the subsequent solenoid control, the target voltage value calculated in accordance with the equation (2) As the target voltage value.

The MCU 100 calculates the correction value Duty for the error reduction using the target voltage value at the first time and the current battery voltage value Vbatt at the first time (S240).

Specifically, it is calculated through the following equation (3).

Equation 3: Duty = V1 / Vbatt

Here, Vbatt is the voltage of the current battery, and the voltage value of the battery being actually outputted is input to the MCU 100 ADC and confirmed.

If a correction value (Duty) for reducing the error is calculated, the MCU 100 applies a correction value for reducing the error (S250).

In step S240, a correction value (Duty) for reducing the error is in the form of V1 / Vbatt, which can be regarded as a constant. As a result, it is possible to control the ratio of the voltage, that is, Thereby reducing the error.

FIG. 5 is a graph illustrating a voltage value correction based on a correction value (Duty) for error reduction calculated in step S240. It can be confirmed through the correction that the voltage value is lower than the target voltage value V1 at the first time calculated in step S230 by a predetermined value. Here, if the time point at which the correction value is applied is after the predetermined time from the first time, it can be regarded as a time required to calculate the correction value (Duty) for reducing the error, specifically, a delay time different from the execution time of each function.

6 is a graph showing a graph in which a voltage value is corrected through a correction value (Duty) for error reduction calculated in step S240, and as a result, a current value is corrected. The correction of the current value is applied after a predetermined time after the correction of the voltage value, which can be regarded as the time required for the corrected voltage value to be reflected in the current value.

The method for reducing the error of the solenoid control according to an embodiment of the present invention has been described. If the change of the transmission oil temperature exceeding the predetermined range is detected after the step S250 (S260), each step is repeatedly performed as shown in FIG. 7 . Here, the predetermined range may be set by the user, but it is generally required that the solenoid control needs to be re-established as the temperature difference of the transmission oil occurs.

Also, in this case, the MCU 100 may set the first time in step S210 as a new first-T time, and set the time after the control cycle T of the solenoid as a new first time from the new first-T time , The time at which the change in the transmission oil temperature exceeding the predetermined range is sensed may be set as a new first time (S270), and each step may be repeatedly performed. In either case, however, the new first time should be a current stabilized state.

Meanwhile, the error reduction method of the solenoid control according to the embodiment of the present invention described above can be implemented by a computer program stored in the medium. In this case, the computer program will be in a form that can be driven by the MCU 100 of the vehicle, and all the technical features of the error reduction method of the solenoid control can be equally implemented.

Also, the error reduction method of the solenoid control according to the embodiment of the present invention described above may be implemented not only by the computer program stored in the medium, but also by the MCU 100 for reducing the error of the solenoid control. In this case, the premise applied to the error reduction method of the solenoid control according to the embodiment of the present invention described above is also applied to the MCU 100 for solenoid error reduction. Hereinafter, a description will be made with reference to FIG.

8 is a diagram showing the overall configuration of an MCU 100 for error reduction of solenoid control according to another embodiment of the present invention. The MCU 100 may include a representative resistance value calculating unit 10, a predicted resistance value calculating unit 20, a target voltage value calculating unit 30 and a correction value calculating unit 40, May also include all of the additional components necessary to achieve the desired performance.

In the meantime, although it has been described that the respective steps are performed by the MCU 100 in the solenoid control error reduction method according to the embodiment of the present invention described above, more specifically, each step includes the representative resistance value calculating unit 10, Value calculating section 20, the target voltage value calculating section 30, and the correction value calculating section 40, as will be described later.

The representative resistance value calculating section 10 calculates the representative resistance value (Radap) of the solenoid coil. Specifically, the current value A1 at the first time is received and used to calculate the representative resistance value (Radap) of the solenoid coil using the target voltage value (V0) at the first-T time.

Where T is the control period of the solenoid, typically 10 ms, but is fluidically adjustable. Also, the first time may be an arbitrary time, but the current value A1 measured at the first time is a current value after the current generated by the target voltage value V0 at the first-T time is stabilized Therefore, it is preferable that the first time or the first time is a time when a predetermined time has elapsed after the start of the vehicle. This is because a certain period of time is required from when the vehicle starts to be started until the current stabilizes.

The current value and the target voltage value at the first time and the first-T time can be confirmed with reference to FIGS. 2 and 3 described above. First, it can be confirmed that the current value is steadily increased from the first-T time toward the first time, and stabilized to A1 from the first time. Which is related to the target voltage value V0 at the first-T time. The current value is generated and stabilized as the target voltage value V0 is injected in the first-T time, and the time required for generation and stabilization is the control period T of the solenoid.

The representative resistance value (Radap) of the solenoid coil can be calculated by the Ohm's law, specifically, it can be calculated through Radap = V0 / A1. Therefore, the representative resistance value calculating section 10 can perform the function of the arithmetic operation. Since the representative resistance value (Radap) of the solenoid coil calculated by the representative resistance value calculation section 10 can be regarded as a representative resistance value calculated by a kind of learning, when V0 is the target voltage value at the first-T time Since A1 is the current value stabilized at the first time after the control period T of the solenoid has elapsed from the first-T time, elements in the first-T time and the first time are all considered in the resistance value calculation to be.

On the other hand, the current value A1 at the first time is input to the MCU ADC to confirm the actual output current value, and the target voltage value V0 at the first-T time is a kind of duty, This is a predetermined value entered by the user. That is, in any case, the representative resistance value calculating unit 10 plays a role of reading these values.

The predicted resistance value calculation unit 20 calculates the predicted resistance value R1 of the solenoid coil at the first time. Specifically, the estimated resistance value calculation unit 20 may be calculated by the following equation (1).

R1 = Radap * (1 + alpha * (T1 - Tadap))

Where T is the temperature of the oil at the first time, and Tadap is the temperature of the oil at the first-T time.

The oil temperature of the transmission at the first time and the first-T time can be confirmed with reference to FIG. In this case, the oil temperature at the first time is T1, the oil temperature at the first-T time is Tadap, the oil temperature T1 at the first time is higher than the oil temperature Tadap at the first-T time, It can be predicted that the temperature of the oil has increased by driving the transmission during the control period T of the solenoid coil T, thereby changing the resistance value of the solenoid coil. Therefore, the predicted resistance value calculating unit 20 must deal with the change of the resistance value according to the temperature difference.

Accordingly, it can be confirmed that the difference between the oil temperature at the first time and the first-T time is considered together with the temperature resistance coefficient of the solenoid coil, and R1 is calculated by the representative resistance value calculating section 10 Is a predicted resistance value of the solenoid coil at the first time calculated based on the representative resistance value (Radap) of one solenoid coil, and is not an accurate resistance value at the actual first time. However, since the representative resistance value (Radap) of the solenoid coil calculated by the representative resistance value calculation section 10 is the representative resistance value calculated by learning during the control period T, and the representative resistance value of the solenoid coil at the first and the first- Since the car has been considered, it can be seen as a resistance value that can give accuracy to the solenoid control.

On the other hand, the temperature resistance coefficient a of the solenoid coil will be 0.00393 / [deg.] C when the solenoid coil is a copper wire as described above, and the temperatures T1 and Tadap at the first time and the first- It is a value measured by an external sensor such as a sensor and input to the MCU. That is, in either case, the predicted resistance value calculating section 20 plays a role of reading these values.

The target voltage value calculating section 30 calculates the target voltage value V1 after the first time. Specifically, the target voltage value calculation unit 30 may be calculated by the following equation (2).

Equation 2: V1 = I1 * R1 + Koffset

Here, Koffset is a constant for offset value correction occurring in the voltage-current relationship, and may be different depending on the solenoid control system installed in the vehicle, and may be zero. The target current value I1 after the first time is a value obtained by replacing the command value Duty received from the MCU with the current target by the solenoid driver IC.

On the other hand, the target voltage value V1 at the first time may be a predetermined value input by the user to the MCU logic as well as the target voltage value V0 at the first-T time, but the resistance value Is calculated separately by the target voltage value calculating section 30 in order to consider the change of the target voltage value. Therefore, the initial predetermined value may be calculated and input through Equation (2), but since the temperature of the transmission oil will be different each time depending on the driving state of the transmission, there is no great benefit since it can not be accurately reflected in advance .

In summary, it suffices that only the target voltage value V0 in the first-T time is sufficient, and in the subsequent solenoid control, the target voltage value calculated in accordance with the equation (2) As the target voltage value.

The correction value calculation unit 40 calculates a correction value (Duty) for error reduction. Specifically, the correction value calculation unit 40 may be calculated by the following equation (3).

Specifically, it is calculated through the following equation (3).

Equation 3: Duty = V1 / Vbatt

Here, Vbatt is the voltage of the current battery, and the voltage value of the battery being actually outputted is input to the MCU ADC and confirmed.

The correction value calculation unit 40 may apply a correction value for reducing the calculated error, and the MCU 100 may further include a separate correction value application unit (not shown).

The correction value (Duty) for error reduction calculated according to Equation (3) is in the form of V1 / Vbatt, which can be regarded as a constant, and as a result, a form for adjusting the ratio of the voltage, that is, The error of the solenoid control is reduced.

A graph for correcting the voltage value through the correction value Duty for error reduction calculated by the correction value calculating unit 40 can be seen in FIG. It can be confirmed that the voltage value is lower by a predetermined value than the target voltage value V1 at the first time calculated by the target voltage value calculating section 30 through the correction. Here, if the time point at which the correction value is applied is after the predetermined time from the first time, it can be regarded as a time required to calculate the correction value (Duty) for reducing the error, specifically, a delay time different from the execution time of each function.

The graph in which the voltage value is corrected through the correction value Duty for the error reduction calculated by the correction value calculating section 40 and the resultant current value is corrected can be confirmed in FIG. The correction of the current value is applied after a predetermined time after the correction of the voltage value, which can be regarded as the time required for the corrected voltage value to be reflected in the current value.

The MCU 100 for solving the error of the solenoid control according to another embodiment of the present invention has been described. When a change in the transmission oil temperature exceeding a predetermined range is sensed after the correction value is applied by the correction value calculation unit 40, the MCU 100 controls the solenoid control Lt; RTI ID = 0.0 > of < / RTI > Here, the predetermined range may be set by the user, but it is generally required that the solenoid control needs to be re-established as the temperature difference of the transmission oil occurs.

In this case, the MCU 100 sets the first time set by the representative resistance value calculating section 10 to the new first-T time and sets the time after the control cycle T of the solenoid from the new first-T time to (Not shown) for setting a new first time, and a time setting unit (not shown) may set a time at which a change in the transmission oil temperature exceeding a predetermined range is detected as a new first time It is possible. In either case, however, the new first time should be a current stabilized state.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, You will understand. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

100: MCU
10: Representative resistance value calculating section
20: prediction resistance value calculating section
30: Target voltage value calculation unit
40: correction value calculating section

Claims (8)

A method for reducing the error of solenoid control,
Wherein the MCU calculates a target voltage value (V0) input in a first-T time (where T is the control period of the solenoid) and a current generated in the first-T time by the target voltage value, Calculating a representative resistance value (Radap) of the coil of the solenoid by using a current value (A1) at a first time which is stabilized after a lapse of a control period of the solenoid from a time point;
Calculating a predicted resistance value (R1) of the solenoid coil at the first time using the calculated representative resistance value of the MCU;
Calculating a target voltage value (V1) after the first time using the predicted resistance value at the first time calculated by the MCU and the target current value (I1) after the first time;
Calculating a correction value (Duty) for error reduction using the target voltage value and the current battery voltage value (Vbatt) after the MCU calculates the first time; And
Applying a correction value for the error reduction calculated by the MCU;
And a solenoid control unit for controlling the solenoid control unit. The method according to claim 1,
The current value (A1) at the first time,
Wherein the current value is a current value after the current generated by the target voltage value (V0) at the first-T time is stabilized. The method according to claim 1,
Calculating the predicted resistance value (R1) of the solenoid coil at the first time,
Wherein the MCU is calculated using the following equation (1).
R1 = Radap * (1 + alpha * (T1 - Tadap))
Where T1 is the temperature of the transmission fluid at the first time, Tadap is the temperature of the transmission fluid at the first-T time, The method according to claim 1,
The step of estimating the target voltage value (V1) after the first time period comprises:
Wherein the MCU is calculated using the following equation (2).
Equation 2: V1 = I1 * R1 + Koffset
(Where Koffset is a constant for offset correction occurring in a voltage-current relationship) The method according to claim 1,
The step of calculating the correction value (Duty) for the error reduction includes:
Wherein the MCU is calculated using Equation (3): " (3) "
Equation 3: Duty = V1 / Vbatt
(Where Vbatt is the voltage of the current battery) The method according to claim 1,
T, which is the control period of the solenoid,
10 ms. ≪ / RTI > The method according to claim 1,
When a change in the transmission oil temperature exceeding a predetermined range is detected after calculating the correction value (Duty) for reducing the error,
Setting a time at which the MCU senses a change in the transmission fluid temperature exceeding the predetermined range to a new first time; And
Wherein the MCU re-executes the error reduction method of the solenoid control. Wherein the target voltage value (V0) input in a first-T time (where T is the control period of the solenoid) and the current generated in the first-T time by the target voltage value are changed from the first-T time A representative resistance value calculating unit for calculating a representative resistance value (Radap) of the coil of the solenoid by using a current value (A1) at a first time that has been stabilized after the control period of the solenoid;
A predicted resistance value calculating section for calculating a predicted resistance value (R1) of the solenoid coil at the first time using the representative resistance value calculated by the representative resistance value calculating section;
Wherein a target voltage value (V1) after the first time is calculated using the predicted resistance value at the first time calculated by the predicted resistance value calculating section and the target current value (I1) after the first time, A voltage value calculation section; And
A correction value calculating unit for calculating a target voltage value at a first time after the target voltage value calculating unit is calculated and a correction value Duty for reducing an error using the current battery voltage value Vbatt;
And an MCU for reducing the error of the solenoid control.

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