JPH10225179A - Control method and control device for linear solenoid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately correct an error between a current command value and a detected drive current by software by a simple constitution, also suppress use of a memory to a minimum limit, perform correction calculation simply and in a short time, and reduce a cost, even in the case of a microcomputer having an intrinsic hardware error. SOLUTION: In a control device and method for a linear solenoid performing feedback control by comparing a drive current flowing in a linear solenoid 1 with a command current value, the control method and control device for the linear solenoid are provided with a correction means 5 correcting a feedback current, based on a correction formula correcting a coefficient as a correction medium partially corrected, by partially correcting the correction medium so as to provide an error 0 in a plurality of command current values.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control method and a control apparatus for a linear solenoid for performing feedback control by comparing a drive current flowing through a linear solenoid with a command current value. The correction medium is partially corrected so that the feedback current is corrected based on the partially corrected correction medium, thereby minimizing the use of the memory, making the correction calculation simple and short, The present invention relates to a linear solenoid control method and control device that reduce costs.

[0002]

2. Description of the Related Art A conventional linear solenoid control method and control device are designed to reduce the current due to hardware factors such as variations in A / D converters and variations in detection resistors for detecting the value of current flowing through the linear solenoid. An error occurs between the command value and the detected feedback current value.

In order to correct the above error, a conventional linear solenoid control method and control device have been proposed in FIG.
As shown in FIGS. 4 to 26, a plurality (three) maps for converting the A / D converted value of the feedback voltage into the feedback current value are prepared in advance, and the map between the current command value and the detected feedback current value is prepared. Is to select a correction map that minimizes the error of.

The above correction map is a map without correction used when the absolute error is within a standard value (FIG. 27 (A)).
And a map for performing a plus correction used when the absolute error deviates from the standard value in the minus direction (FIG. 27).
(B)) and a map for performing a minus correction used when the absolute error is deviated from the standard value in the plus direction (FIG. 2).
7 (C)).

In each map, as shown in Table 1, the voltage of the A / D input port is specified by disconnecting the adjustment resistors R1 and R2. The ECU selects the number of the correction map according to the voltage of the A / D input port when the ignition is turned on.

[Table 1]

[0006] That is, in step 11, as shown in FIG. 26, to set the IR _max is the maximum command value for the linear solenoid current, detects the I _max is the drive current at that time of the linear solenoid at step 12.

In step 13, an absolute error Ie, which is the difference between the maximum command value IR _max of the linear solenoid current and the detected driving current I _max of the linear solenoid, is calculated. In step 14, the calculated absolute error I _max is calculated.
The number of the map corresponding to e is selected.

In step 15, it is selected whether the adjustment resistor corresponding to the number of the selected map is cut or not cut (in a field within the standard value).

[0009]

In the above-described conventional method and apparatus for controlling a linear solenoid, a plurality of correction maps for converting an A / D conversion value of a feedback voltage into a feedback current value are set in advance in accordance with, for example, the limitation of the memory capacity. Since a map for minimizing the error between the current command value and the detected feedback current value is selected from the three maps, it is not always possible to accurately correct the error. There was no problem.

By increasing the number of correction maps,
Accurate correction can be performed accordingly, but a large amount of memory in the microcomputer has to be used, so that it is necessary to increase the capacity of the memory, resulting in an increase in cost.

In addition, there is a difference in the way in which the A / D converter varies among individual microcomputers and in hardware aspects such as the resistance error value of the detection resistor. Since a correction map unique to each microcomputer is selected, a large number of man-hours are required. There was a problem that required.

For example, when this linear solenoid control device is used for shift control of an automatic transmission for a vehicle, a shift shock is severe, and a shift shock occurs only during a specific shift. There was a problem that variations occurred.

In view of the above, the present inventors have proposed a linear solenoid control method and control apparatus for performing feedback control by comparing a drive current flowing through a linear solenoid with a command current value, and reducing errors in a plurality of command current values to zero. The correction medium such as a correction formula or a correction map is partially corrected so that the feedback current is corrected based on the partially corrected correction medium. As a result of the superposition, even if the microcomputer has its own hardware error, the error between the current command value and the detected drive current can be corrected more accurately than the software with a simple configuration, and the memory The present invention achieves the object of minimizing the use of, simplifying and shortening the correction operation, and reducing the cost.

[0014]

According to a first aspect of the present invention, a method for controlling a linear solenoid performs feedback control by comparing a drive current flowing through the linear solenoid with a command current value. In the control method of the linear solenoid, the correction medium is partially corrected so that errors in a plurality of command current values become zero, and the feedback current is corrected based on the partially corrected correction medium.

The present invention (second invention described in claim 2)
According to the linear solenoid control method, in the first aspect, the partial correction content is written in a memory, and the feedback current is corrected based on the written correction content.

The present invention (third invention described in claim 3)
The linear solenoid control device includes a linear solenoid driven by a drive current, current command means for outputting a command current value for operating the linear solenoid, and current detection means for detecting a drive current flowing through the linear solenoid. And a feedback control means for performing feedback control so that the command current value and the detected drive current coincide with each other. In the linear solenoid control device, the correction medium is adjusted so that errors in a plurality of command current values become zero. A correction means for correcting the feedback current based on the partially corrected correction medium based on the partially corrected correction medium is provided.

The present invention (the fourth invention described in claim 4)
The linear solenoid control device according to the third aspect, wherein the correction medium is a correction type, and includes a type correction means for correcting the correction type so that errors in a plurality of command current values become zero. It is.

The present invention (a fifth invention described in claim 5)
The control apparatus for a linear solenoid according to the third aspect, wherein the correction medium is a correction map, and includes a map correction means for correcting the map so that errors in a plurality of command current values become zero. is there.

The present invention (the sixth invention described in claim 6)
The linear solenoid control device according to the fourth or fifth aspect, wherein the temperature detecting means for detecting the ambient temperature and the temperature for correcting the drive current detected by the current detecting means based on the detected ambient temperature. Correction means.

The present invention (a seventh invention described in claim 7)
The linear solenoid control device according to the fourth or sixth aspect, wherein the correction formula is a primary correction formula,
The coefficient of the primary correction equation is corrected so that an error in at least two command current values becomes zero.

The present invention (an eighth invention described in claim 8)
In the linear solenoid control device according to the seventh aspect, the command current values of the at least two points are a maximum value and a minimum value of the command current value.

The present invention (a ninth aspect of the present invention)
The control device for a linear solenoid according to the fourth or sixth aspect, wherein the correction formula is a correction formula by a least squares method, and the correction formula is such that an error in at least three command current values becomes zero. Is corrected.

[0023]

According to the first aspect of the present invention, there is provided a linear solenoid control method comprising the steps of: partially correcting a correction medium so that errors in a plurality of command current values become zero;
Since the feedback current is corrected based on the partially corrected correction medium, the error between the current command value and the detected drive current is accurately corrected, the use of the memory is minimized, and the correction calculation is performed. This has the effect of simplifying and shortening the time and reducing the cost.

According to the linear solenoid control method of the second invention having the above-mentioned structure, in the first invention, the partial correction contents are written in the memory, and the feedback current is corrected based on the written correction contents. Are minimized, the correction operation is simplified and shortened, and the cost is reduced.

In the control apparatus for a linear solenoid according to a third aspect of the present invention, the correction means partially corrects the correction medium so that errors in a plurality of command current values become zero, and the correction medium is partially corrected. Since the feedback current is corrected based on the corrected medium, the error between the current command value and the detected drive current can be corrected more accurately with a simple configuration than the software, and the use of memory is minimized.
This has the effect of simplifying the correction operation in a short time and reducing the cost.

According to a fourth aspect of the present invention, in the linear solenoid control device according to the third aspect of the present invention, in the third aspect, the expression correcting means sets the correction expression, which is the correction medium, to zero in a plurality of command current values. Since the correction is performed as described above, the use of the memory is suppressed to a minimum, the correction operation is simplified and the time is shortened, and the cost is reduced.

In the linear solenoid control device according to a fifth aspect of the present invention, the map correction means according to the third aspect of the present invention, wherein the correction map is configured to reduce the error in a plurality of command current values to zero. Since the correction is partially performed so as to achieve the effect, the use of the memory can be suppressed to a minimum, the correction operation can be performed easily and in a short time, and the cost can be reduced.

The linear solenoid control device according to a sixth aspect of the present invention is the linear solenoid control device according to the fourth or fifth aspect, wherein the temperature correction means is configured to control the temperature detection means based on the ambient temperature detected by the temperature detection means. Since the drive current detected by the correction is corrected, an error caused by a change in the ambient temperature can be corrected, so that it is possible to correct the error with higher accuracy.

In the linear solenoid control device according to a seventh aspect of the present invention, in the fourth or sixth aspect, the correction formula is a primary correction formula, and the error in the command current value of at least two points is zero. Since the coefficient of the primary correction equation is corrected so that the following equation is obtained, the use of the memory is suppressed to a minimum, the correction operation is made simple and short, and the cost is reduced.

According to the eighth aspect of the present invention, in the linear solenoid control device according to the seventh aspect of the present invention, since the command current values of the at least two points are the maximum value and the minimum value of the command current value, Since the coefficient of the primary correction formula is corrected so that the error in the command current value at the two points of the maximum value and the minimum value becomes zero, the correction operation is simplified and shortened, and the use of the memory is minimized. The effect is that the cost is reduced.

A ninth aspect of the present invention is a linear solenoid control device according to the fourth or sixth aspect, wherein the least squares correction method is used so that an error in at least three command current values becomes zero. Is corrected, it is possible to achieve more accurate error correction.

[0032]

Embodiments of the present invention will be described below with reference to the drawings.

(First Embodiment) A control device and a control method of a linear solenoid according to a first embodiment are applied to a shift control of an automatic transmission for a vehicle. As shown in FIGS. In a linear solenoid control device and method for performing feedback control by comparing a drive current flowing through a solenoid 1 and a command current value, a correction medium is partially corrected so that errors in a plurality of command current values become zero. A correction means 5 for correcting a feedback current based on a correction formula in which a coefficient as a correction medium partially corrected is corrected.

The linear solenoid 1 is disposed in an automatic transmission 10 for a vehicle as shown in FIGS.
The shift control is performed by being driven by the drive current.

As shown in FIGS. 1 and 2, the current command means 2 is an EC which is a calculating means in the first embodiment.
U6, connected to the CPU 60, the linear solenoid 1
Is output, and the output command current value is detected by the command current value detecting means 21.

That is, as shown in FIG. 2, the current command means 2 includes a shift control unit 22 to which signals of throttle, vehicle speed, and range are inputted, a clutch oil pressure operation unit 23 for calculating the oil pressure of the clutch, And a hydraulic current converter 24 that converts the current into a current corresponding to the current.

The current detecting means 3 is provided in a circuit between the ECU 6 and the linear solenoid 1, and is configured to detect a driving current from the ECU 6 that actually drives the linear solenoid 1 as a feedback voltage. Have been.

The feedback control means 4 is configured to perform feedback control so that the drive current detected by the current detection means 3 matches the command current value.

The correction means 5 calculates correction coefficients a and b for correcting the coefficients of the primary correction equation as the correction equations so that the error between the maximum value and the minimum value of the command current value as the equation correction means becomes zero. And a correction coefficient writing means 52 for writing the calculated correction coefficients a and b into the memory of the CPU.

The correction means 5 includes an A / D converter 53 for converting a feedback voltage output from the current detection means 3 into a digital value, and a correction coefficient for setting a correction coefficient stored in the memory by communication. Setting means 54
And a current conversion unit 55 that converts the correction coefficient stored in the memory into a feedback current _ifb using the correction coefficients a and b calculated based on the digital value converted to correct the correction coefficient. I have.

The feedback control means 4 provides a predetermined feedback gain to the command current value output from the command current value detection means 21 by using the converted feedback current _ifb output from the current converter 55. Feedback by the voltage / duty converter 4
1 and a drive current having a predetermined duty ratio via the duty output circuit 42 is output to the linear solenoid 1.

A flowchart for error correction in the first embodiment, which is stored in the ROM as the memory of the CPU 60 of the ECU 6, will be described with reference to FIG.

In step 101, a = 1 and b = 0 are written in the CPU 60 of the ECU 6, and in step 102, the minimum command value IR _min of the linear solenoid current is set.

In step 103, the minimum command value IR
The drive current I _min of the linear solenoid 1 when _min is set is detected by the current detection means 3.

In step 104, when the maximum command value IR _max of the linear solenoid current is set, in step 105, the drive current I _max of the linear solenoid 1 when the maximum command value IR _max is set is detected by the current detection. Detected by means 3.

In step 106, based on the driving currents I _min and I _{max of the} linear solenoid 1 detected by the current detecting means 3, the minimum command value IR _min and the maximum command value IR _max , as shown in FIG. According to the following equations 1 and 2, the correction coefficient calculating means 51 calculates correction coefficients a and b for correcting the coefficients of the primary correction equation.

(Equation 1)

(Equation 2) a is a tilt correction coefficient, and b is an offset correction value.

In step 107, the calculated correction coefficients a and b are written in the keep memory of the CPU 60 of the ECU 6.

In the control method of the linear solenoid control device according to the first embodiment having the above structure, the current command means 2 outputs a command current value for operating the linear solenoid 1 and outputs the output command current. The value is detected by the command current value detecting means 21.

The current detecting means 3 detects a drive current from the ECU 6 for actually driving the linear solenoid 1 as a feedback voltage.

In the correcting means 5, the A / D converter 53 converts the feedback voltage output from the current detecting means 3 into a digital value, and the correction coefficient setting means 54 stores the digital value in the memory by communication. The current conversion unit 55 sets a correction coefficient to be corrected, and uses the correction coefficients a and b calculated based on the digital value converted to correct the correction coefficient stored in the memory. Convert to _ifb .

That is, in the correcting means 5, the correction coefficient calculating means 51 as the equation correcting means calculates the coefficient of the primary correction equation as the correcting equation so that the error between the maximum value and the minimum value of the command current value becomes zero. Correction coefficient a to be corrected,
b, and the correction coefficient writing means 52 writes the calculated correction coefficients a and b into the keep memory of the CPU.

The feedback control means 4 corrects the command current value output from the command current value detection means 21 based on the calculated correction coefficients a and b output from the current conversion unit 55. and feedback predetermined feedback gain by converted the feedback current i _fb, via a voltage-duty converter 41 and the duty output circuit 42 outputs a drive current having a predetermined duty ratio to the linear solenoid 1.

The linear solenoid 1 is driven by a drive current having an input duty ratio to control the shift of the automatic transmission for a vehicle.

In the linear solenoid control method according to the first embodiment having the above-described operation, the coefficient of the correction formula is corrected so that the error in a plurality of command current values becomes zero, and the coefficient is corrected based on the corrected correction formula. Since the feedback current is corrected, the error between the current command value and the detected drive current is accurately corrected, and the use of the memory is minimized.
This has the effect of simplifying the correction operation in a short time and reducing the cost.

In the linear solenoid control method according to the first embodiment, the calculated correction coefficient in the correction equation is written in the memory, and the feedback current is corrected based on the written correction content. In this case, the correction operation can be simplified and performed in a short time, and the cost can be reduced.

In the control device for a linear solenoid according to the first embodiment having the above operation, the correction means 5 corrects the coefficients of the correction formula so that the error between the two command current values becomes zero, and corrects the coefficients. Since the feedback current is corrected based on the corrected correction formula, the error between the current command value and the detected drive current is more accurately corrected by a simple configuration than the software surface, as shown in FIGS. Thus, the use of the memory is suppressed to a minimum, the correction calculation is made simple and short, and the cost is reduced.

In the linear solenoid control device according to the first embodiment, the correction equation is a primary correction equation, and the coefficient of the primary correction equation is corrected so that an error in at least two points of the command current value becomes zero. Therefore, the use of the memory is suppressed to a minimum, the correction calculation is made simple and short, and the cost is reduced.

Further, in the linear solenoid control device of the first embodiment, since the command current values of the at least two points are the maximum value and the minimum value of the command current value, the control current value of the command current value is the maximum value and the minimum value of the command current value. Since the coefficient of the primary correction equation is corrected so that the error between the two command current values becomes zero, accurate correction of the error is enabled, and the correction operation is simplified and performed in a short time. This has the effect of minimizing use and reducing costs.

That is, as shown in FIG. 5, if the absolute error changes linearly in a linear manner as the command current value increases, the primary correction equation is substituted by substituting the current values at at least two points, if any. Since the correction coefficient can be obtained, the man-hour of the operator before executing the control of the linear solenoid can be minimized, and the efficiency can be improved.

Further, since the linear solenoid control device of the first embodiment makes correction on the software side by a correction formula, it eliminates the need for a plurality of maps as in the conventional device. For the EC,
There is an effect that the memory of U6 can be saved.

Further, the linear solenoid control device of the first embodiment has no restriction on the correction accuracy of the error caused by the restriction on the number of maps stored in the memory in advance as in the conventional device, so that a highly accurate error This makes it possible to perform the correction and suppress the shift shock.

The linear solenoid control device according to the first embodiment corrects the variation in the circuit of the microcomputer of the ECU by a correction formula suitable for each. Therefore, when the control of the linear solenoid 1 is started, the current command value is reduced. And an absolute error between the detected drive current value and the actual detected drive current value can be suppressed.

Further, since the control apparatus for a linear solenoid according to the first embodiment is applied to an automatic transmission for a vehicle, the control of the linear solenoid having exactly the same characteristics for each automatic transmission is also performed. Since the device is provided, it is possible to suppress the variation of the automatic transmission itself.

(Second Embodiment) The linear solenoid control apparatus and control method of the second embodiment corrects the coefficients of the correction equation in the first embodiment, whereas FIG.
The difference is that the map is partially corrected as shown in FIG. 9, and the difference will be mainly described, and the same portions will be denoted by the same reference numerals and description thereof will be omitted.

The correction means 5 includes a minimum value IR _{min to a} maximum value IR of the command current value as the map correction means 56.
command value for each certain interval at _max and the current detection means 3
Error calculating means 561 for calculating an error from the drive current detected by the above, a correction map creating means 562 for creating a correction map based on the calculated error, and correction for writing the correction map to the memory of the CPU 60 of the ECU 6 Map writing means 563.

The correction means 5 includes an A / D converter 53 for converting a feedback voltage output from the current detection means 3 into a digital value, and a map setting means for setting a map stored in the memory by communication. 541,
A current conversion unit 551 that converts the map into a feedback current _ifb using the correction map calculated based on the digital value converted to correct the map stored in the memory.

The feedback control means 4 provides a predetermined feedback gain to the command current value output from the command current value detection means 21 by using the converted feedback current _ifb output from the current converter 55. Feedback by the voltage / duty converter 4
1 and a drive current having a predetermined duty ratio via the duty output circuit 42 is output to the linear solenoid 1.

A flowchart for error correction in the second embodiment, which is stored in the ROM which is the memory of the CPU 60 of the ECU 6, will be described with reference to FIG.

In step 201, a map of the correction amount = 0 is written in the keep memory of the CPU 60 of the ECU 6, and in step 202, the minimum command value IR _min of the linear solenoid current is set.

In step 203, it is confirmed that n is 0, and in step 204, the minimum command value IR
The drive current I _min of the linear solenoid 1 when _min is set is detected by the current detection means 3.

In step 205, an absolute error Ie = I-IR represented by the difference between the set current command value IR and the drive current I detected by the current detecting means 3 is calculated. The correction amount Ie is set at the n-th position in the map.

In step 207, 1 is added to n, and in step 208, the current command value IR at the interval n + 1 next to n is obtained. That is, the difference dIR from the current command value IR at the interval n is the correction map step amount.

In step 209, it is determined whether or not the obtained current command value IR exceeds the maximum command value IR _max of the linear solenoid current.

If it has exceeded, in step 210, the correction map is written in the keep memory of the CPU 60 of the ECU 6;
Return to 04.

In the control apparatus for a linear solenoid according to the second embodiment, the map correction means may determine that the correction map, which is the correction medium, has an error in a plurality of command current values of zero.
Therefore, as shown in FIGS. 10 and 11, there is an effect that the error between the current command value and the detected drive current is accurately corrected.

The control device for the linear solenoid according to the second embodiment corrects the map previously written in the keep memory of the CPU 60 of the ECU 6 and corrects the feedback current, thereby minimizing the use of the memory. In addition, there is an effect that the correction calculation is made simple and short, and the cost is reduced.

Further, the control device for the linear solenoid of the second embodiment corrects one map written in the keep memory of the CPU 60 and corrects the feedback current, so that it is stored in a memory like a conventional device in advance. Since there is no restriction on the correction accuracy of the error caused by the restriction on the number of maps on the map, it is possible to correct the error with high accuracy and to suppress the shift shock.

(Third Embodiment) A control device and a control method for a linear solenoid according to a third embodiment are different from the first embodiment in that E is as shown in FIGS.
The difference is that an ambient temperature detecting means 7 for detecting the ambient temperature of the CU and a temperature correcting means 8 for correcting the feedback current based on the detected ambient temperature of the ECU are added. The same parts are denoted by the same reference numerals and their description is omitted.

The ambient temperature detecting means 7 is arranged around the ECU, and is configured to detect the ambient temperature of the ECU in order to correct the feedback current.

The temperature correcting means 8 calculates the detected values IO _min and IO _max of the drive current based on the ambient temperature of the ECU detected by the ambient temperature detecting means 7.
Correct to _min and I _max .

That is, the temperature compensating means 8 can
Correction values Ie _min and Ie when CU is at standard operating temperature
_The drive current detection values IO _min and IO according to the following equations 3 and 4 so that the absolute error becomes 0 by _max.
max is corrected, and the detection values IO _min and IO _max are obtained.

(Equation 3)

(Equation 4)

The correction means 5 is a formula correction means similar to that of the first embodiment, wherein the correction coefficient calculating means 51 calculates I _min and I _max based on the ambient temperature.
The correction coefficients a and b for correcting the coefficients of the primary correction equation as the correction equations are calculated so that the error between the maximum value and the minimum value of the command current value becomes 0, and the correction coefficient writing means 52
Are configured to write the calculated correction coefficients a and b into the memory of the CPU.

The feedback control means 4 responds to the command current value output from the command current value detection means 21 by
And feedback predetermined feedback gain by the feedback current i _fb, which has been converted is output from the current conversion unit 55, the drive current having a predetermined duty ratio through the voltage-duty converter 41 and the duty output circuit 42 It is configured to output to the linear solenoid 1.

RO which is a memory of the CPU 60 of the ECU 6
A flowchart for error correction in the third embodiment stored in M will be described with reference to FIG.

In step 301, a = 1 and b = 0 are written in the CPU 60 of the ECU 6. In step 302, the ambient temperature of the ECU is detected by the ambient temperature detecting means 7.

In step 303, the minimum command value IR _min of the linear solenoid current is set. In step 304, the drive current IO _min for driving the linear solenoid 1 is detected by the current detecting means 3.

In step 305, the temperature correction means 8 detects the driving current IO based on the ambient temperature of the ECU detected by the ambient temperature detecting means 7.
Correct _min to I _min .

In step 306, the maximum command value IR _max of the linear solenoid current is set, and in step 307, the drive current IO _max for driving the linear solenoid 1 is detected by the current detection means 3.

In step 308, the temperature correction means 8 detects the drive current IO based on the ambient temperature of the ECU detected by the ambient temperature detection means 7.
Correct _max to I _max .

In step 309, the detected values I _min , I _max and IR _{min of} the driving current corrected by the temperature correcting means 8 based on the ambient temperature of the ECU.
Based on the IR _max , the correction coefficients a and b of the correction formula are calculated as shown in FIG. 15 as in the first embodiment.

In step 310, the calculated correction coefficients a and b are written in the keep memory of the CPU 60 of the ECU 6.

In the control device for a linear solenoid according to the third embodiment, the temperature correction means 8 corrects the drive current detected by the current detection means 3 based on the ambient temperature detected by the ambient temperature detection means 7. Therefore, as shown in FIG. 16 and FIG. 17, there is an effect that it is possible to correct an error caused by a change in the ambient temperature and to correct the error with higher accuracy.

That is, it goes without saying that when comparing the ambient temperature of the ECU detected before the execution of the control of the linear solenoid and the ambient temperature during the execution of the control, there is a considerable difference. At the start of the execution (before the execution) and at each time during the execution, a deviation occurs in the actual drive current value detected by the current detection means, but based on the ambient temperature detected by the ambient temperature detection means 7, Since the temperature correction means 8 corrects the drive current detected by the current detection means 3 in advance, it is possible to always correct the error with high accuracy.

Further, in the control device for a linear solenoid according to the third embodiment, the correction means 5 corrects the coefficients of the correction formula based on the detected values I _min and I _max of the drive current corrected by the ambient temperature. Since the feedback current is corrected, there is an effect that the error can be corrected with higher accuracy.

Further, in the control apparatus for a linear solenoid according to the third embodiment, the correction equation is a primary correction equation, and the coefficient of the primary correction equation is corrected so that an error in at least two command current values becomes zero. Therefore, the use of the memory is suppressed to a minimum, the correction calculation is made simple and short, and the cost is reduced.

(Fourth Embodiment) A control device and a control method for a linear solenoid according to a fourth embodiment of the present invention are characterized in that the actual values of the maximum and minimum values of the command current in the third embodiment are corrected based on the ambient temperature and the primary Unlike the correction of the coefficients of the correction formula, the difference between the correction formula and the correction of the least squares method is shown in FIGS. The following description focuses on the differences, and the same parts are denoted by the same reference numerals and description thereof is omitted.

As apparent from FIGS. 18 and 19, FIG.
Since the basic configuration is the same as that of the third embodiment shown in FIGS. 2 and 13, the description will be made with reference to FIGS.

RO which is a memory of the CPU 60 of the ECU 6
A flowchart for correcting an error by correcting the actually measured values of five points stored in M according to the ambient temperature and correcting the coefficients of the correction formula by the least squares method in the fourth embodiment will be described with reference to FIG. I do.

In step 401, a = 1 and b = 0 are written in the CPU 60 of the ECU 6, and in step 402, it is confirmed that n is -2.

In step 403, a current command value IR _n (n = −2) of the linear solenoid is set. In step 404, a driving current I _n (n = _n ) for driving the linear solenoid 1 by the current detecting means 3 is set. −
2) is detected.

In step 405, 1 is added to n. That is, n is set to −1, and the current command value IR of the linear solenoid is set in the same manner as described above until n becomes 2.
_{n (n} = -1,0,1,2) with sets, the current driving current I _n of the linear solenoid 1 is driven by the detection means 3 (n = -1,0,1,2) is detected Is done.

In step 406, when n exceeds 2, in step 407, the current command value IR _n (n =
-2) to on the basis of IR _n (n = 2) and command value I _n of the drive current (n = -2) to I _n (n = 2), 2
As shown in FIG. 1, a correction coefficient of the correction equation is calculated by the least square method.

That is, the slope a is calculated based on the following equation 5, the intercept k of IR0 is calculated based on the following equation 6, and the offset correction amount b is calculated based on the following equation 7.

(Equation 5)

(Equation 6)

(Equation 7)

In the control device for a linear solenoid according to the fourth embodiment, the equation correction means constituting the correction means 5 is such that the error in the command current value of the five points, which is larger than the two points of the third embodiment, is zero. Since the coefficient of the correction formula by the least squares method is corrected so as to satisfy, it is possible to correct the error with higher accuracy, and it is possible to reduce the absolute error as shown in FIGS. 22 and 23. It works.

In the control device for a linear solenoid according to the fourth embodiment, the temperature correction means 8 corrects the drive current detected by the current detection means 3 based on the ambient temperature detected by the ambient temperature detection means 7. Therefore, it is possible to correct an error caused by a change in the ambient temperature, thereby enabling an error to be corrected with higher accuracy.

Further, the linear solenoid control device of the fourth embodiment corrects the coefficients of the above-mentioned correction formula by the least squares method so that errors in a plurality of command current values become zero. This has the effect of minimizing the amount of correction, making the correction calculation simple and short, and reducing the cost.

The above-described embodiments are exemplarily described for explanation, and the present invention is not limited to these embodiments. Those skilled in the art will recognize from the claims, the detailed description of the invention, and the drawings. Modifications and additions are possible without departing from the technical idea of the present invention.

The above-described fourth embodiment has described an example in which the drive current is corrected based on the detected ambient temperature, and the feedback current is corrected by correcting the coefficient of the correction formula by the least square method. However, the present invention is not limited thereto, and an embodiment in which the coefficient of the above-described correction formula is corrected by the least square method without correcting the drive current based on the ambient temperature can be adopted.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a control device and a control method of a linear solenoid according to a first embodiment applied to an automatic transmission for a vehicle according to the present invention.

FIG. 2 is a functional block diagram for explaining functions of the first embodiment.

FIG. 3 is a chart showing an error correction procedure in the first embodiment.

FIG. 4 is a diagram for explaining a correction equation and a correction coefficient in the first embodiment.

FIG. 5 is a diagram illustrating a relationship between a command value and an error before correction is performed in the first embodiment.

FIG. 6 is a diagram illustrating a relationship between a command value and an error after the correction is performed in the first embodiment.

FIG. 7 is a block diagram showing a control device and a control method of a linear solenoid according to a second embodiment applied to an automatic transmission for a vehicle according to the present invention.

FIG. 8 is a functional block diagram for explaining functions of the second embodiment.

FIG. 9 is a chart showing an error correction procedure in the second embodiment.

FIG. 10 is a diagram illustrating a relationship between a command value and an error before correction is performed in the second embodiment.

FIG. 11 is a diagram showing a relationship between a command value after correction and an error in the second embodiment.

FIG. 12 is a block diagram illustrating a control device and a control method of a linear solenoid according to a third embodiment applied to an automatic transmission for a vehicle according to the present invention.

FIG. 13 is a functional block diagram for explaining functions of the third embodiment.

FIG. 14 is a chart showing an error correction procedure in the third embodiment.

FIG. 15 is a diagram for explaining a correction equation and a correction coefficient according to the third embodiment.

FIG. 16 is a diagram showing a relationship between a command value and an error before correction is performed in the third embodiment.

FIG. 17 is a diagram illustrating a relationship between a command value and an error after correction is performed in the third embodiment.

FIG. 18 is a block diagram showing a control device and a control method of a linear solenoid according to a fourth embodiment applied to a vehicle automatic transmission according to the present invention.

FIG. 19 is a functional block diagram for explaining functions of the fourth embodiment.

FIG. 20 is a chart showing an error correction procedure in the fourth embodiment.

FIG. 21 is a diagram for explaining a correction equation and a correction coefficient according to the fourth embodiment.

FIG. 22 is a diagram illustrating a relationship between a command value and an error before correction is performed in the fourth embodiment.

FIG. 23 is a diagram illustrating a relationship between a command value and an error after correction is performed in the fourth embodiment.

FIG. 24 is a block diagram showing a control device and a control method of a conventional linear solenoid.

FIG. 25 is a functional block diagram for explaining functions of a conventional control device.

FIG. 26 is a chart showing an error correction procedure in a conventional control device.

FIG. 27 is a diagram showing three types of correction maps in a conventional control device.

[Explanation of symbols]

 1 linear solenoid 5 correction means

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Akihiko Kato 10 Takane, Fujii-machi, Anjo, Aichi Prefecture Inside Aisin AW Co., Ltd. (72) Kenji Suzuki 10 Takane, Fujii-cho, Anjo, Aichi Prefecture Aisin・ AW Co., Ltd.

Claims (9)

[Claims] 1. A linear solenoid control method for performing feedback control by comparing a drive current flowing through a linear solenoid with a command current value, wherein a correction medium is partially adjusted so that errors in a plurality of command current values become zero. A method of controlling a linear solenoid, wherein a feedback current is corrected based on a corrected medium that has been corrected and partially corrected. 2. The linear solenoid control method according to claim 1, wherein the partial correction content is written in a memory, and a feedback current is corrected based on the written correction content. 3. A linear solenoid driven by a drive current, current command means for outputting a command current value for operating the linear solenoid, current detection means for detecting a drive current flowing through the linear solenoid, A linear solenoid control device comprising feedback control means for performing feedback control so that the current value matches the detected drive current, wherein the correction medium is partially adjusted so that errors in a plurality of command current values become zero. A control device for a linear solenoid, comprising: a correction unit that corrects a feedback current based on a correction medium that has been corrected and partially corrected. 4. The correction medium according to claim 3, wherein the correction medium is a correction expression, and the correction medium includes an expression correction means for correcting the correction expression so that an error in a plurality of command current values becomes zero. Control device for linear solenoid. 5. The correction medium according to claim 3, wherein the correction medium is a correction map, and further includes a map correction unit that partially corrects the map so that errors in a plurality of command current values become zero. The control device of the linear solenoid. 6. The apparatus according to claim 4, further comprising: a temperature detection unit configured to detect an ambient temperature; and a temperature correction unit configured to correct a drive current detected by the current detection unit based on the detected ambient temperature. A control device for a linear solenoid. 7. The correction formula according to claim 4, wherein the correction formula is a primary correction formula, and a coefficient of the primary correction formula is corrected so that an error in at least two command current values becomes zero. The control device of the linear solenoid. 8. The linear solenoid control device according to claim 7, wherein the command current values of the at least two points are a maximum value and a minimum value of the command current value. 9. The correction formula according to claim 4, wherein the correction formula is a correction formula based on a least squares method, and a coefficient of the correction formula is corrected so that an error in at least three command current values becomes zero. A linear solenoid control device characterized by the following: