JP3547602B2 - Solenoid characteristic correction device - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a solenoid characteristic correction device, and more particularly, to a device for compensating a characteristic variation in a solenoid used for controlling an operating oil pressure in an automatic transmission for a vehicle, for example, in a line process.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in an automatic transmission for a vehicle, there has been known a mechanism in which a plunger is displaced by a solenoid to change an opening area of an oil path, thereby adjusting a hydraulic pressure for various friction engagement elements (clutch, brake, etc.). Have been.
[0003]
Here, in driving the plunger by the solenoid, generally, a return spring (elastic member) for urging the plunger in one direction is provided, and a magnetic force of the solenoid is applied against the urging force of the return spring. However, since the set load of the return spring greatly varies, an adjusting mechanism (adjustment screw) for adjusting the set load is provided, and the set load is individually manually adjusted by the adjusting mechanism. Adjustment to the reference value has been performed in a line process during manufacturing and assembly.
[0004]
[Problems to be solved by the invention]
However, providing the adjustment mechanism on the solenoid as described above has a problem that the cost increases and the size of the solenoid increases. Furthermore, in the configuration in which the adjusting mechanisms are individually operated to adjust the set load manually, there is a problem that the number of adjustment steps is increased.
[0005]
The present invention has been made in view of the above problems, and an object of the present invention is to provide a solenoid characteristic correction device capable of compensating for variations in set load in a line process without providing an adjustment mechanism for the solenoid.
[0006]
[Means for Solving the Problems]
Characteristic correction apparatus therefor solenoid according to a first aspect of the present invention, a solenoid comprising an elastic member for urging the movable iron core, the set load of the elastic member is detected as a parameter indicating the characteristics of the solenoid Characteristic parameter detection means, a reference value storage means in which a reference set load is stored in advance, a set load detected by the characteristic parameter detection means, and a reference set load stored in the reference value storage means , Calibration information output means for obtaining calibration information in the control of the solenoid and writing the calibration information to a storage medium of a control device of the solenoid .
[0007]
According to this configuration, the set load of the elastic member (generally, a coil spring) in the solenoid is detected, and the comparison between the set load and the reference set load detects variation in the set load of each solenoid.
[0008]
Then, instead of adjusting the set load to the reference value, the calibration information in the control of the solenoid is obtained from the comparison result between the actual value of the set load and the reference value so that the control according to the variation of the set load is performed. The obtained values are stored in the control device, and the individual solenoids are controlled according to the variation in the set load during the actual control .
[0009]
According to a second aspect of the present invention, when the calibration information is written by the calibration information output means to the storage medium of the control device, the control program of the solenoid is simultaneously written to the storage medium.
[0010]
According to such a configuration, the calibration information is written simultaneously with the writing of the control program to the storage medium (generally, the ROM) of the control device, so that the calibration information is stored as the same nonvolatile information as the control program. be able to.
[0011]
According to a third aspect of the present invention, the calibration information written to the storage medium by the calibration information output means is a correction amount for correcting a correlation between an operation amount and a control amount of the solenoid.
[0012]
According to this configuration, when the control device obtains the control amount corresponding to the target value by referring to the basic value of the correlation between the operation amount (for example, the drive current) and the control amount (for example, the fluid pressure or the fluid flow rate). By correcting the target value or the operation amount determined from the basic characteristics, the characteristic variation of the solenoid is corrected.
[0013]
According to a fourth aspect of the present invention, the calibration information written into the storage medium by the calibration information output means is a calibrated correlation between an operation amount and a control amount of the solenoid.
[0014]
According to this configuration, since the correlation between the operation amount and the control amount referred to in the control of the solenoid by the control device is calibrated in advance according to the characteristic variation of the solenoid, the operation is performed by directly referring to the calibrated correlation. By determining the amount, the characteristic variation is corrected.
[0015]
In the invention according to claim 5 , the calibration information output means is provided only when the set load detected by the characteristic parameter detection means is within a predetermined range including the reference set load stored in the reference value storage means. The calibration information is configured to be written.
[0016]
According to this configuration, if the predetermined range including the reference set load stored in the reference value storage unit is set as the range of the predicted characteristic variation, when the actual set load detection result is out of the predetermined range, Means that it is highly likely that the set load is erroneously detected.
[0017]
Therefore, only when the value is within the predetermined range, it is determined that the characteristic variation of the solenoid is correctly detected, and the calibration information is written. When the characteristic deviation is out of the predetermined range, the characteristic variation of the solenoid (set It is determined that the load has been erroneously detected, and the writing of the calibration information based on the detection result of the set load at that time is prohibited, and a measure such as performing the detection again is taken.
[0018]
【The invention's effect】
According to the first aspect of the present invention, by actually detecting the set load and comparing the set load with the reference set load, there is an effect that it is possible to perform control that compensates for the characteristic variation due to the variation in the set load .
[0019]
According to the second aspect of the present invention, since the calibration information is written to the same storage medium at the same time as the writing of the control program to the storage medium of the control device, the calibration information is stored in a nonvolatile memory such as a ROM in which the control program is stored. There is an effect that can be.
[0020]
According to the third aspect of the present invention, the basic information of the correlation is corrected by the correction amount by writing the calibration information to the storage medium of the control device as the correction amount of the correlation between the operation amount and the control amount, and There is an effect that it is possible to output to the solenoid an operation amount that can obtain a target value even if there is a characteristic variation.
[0021]
According to the invention described in claim 4, the result of correcting the correlation between the operation amount and the control amount according to the characteristic variation of the solenoid is written as calibration information in the storage medium of the control device, so that the characteristics of each solenoid are matched. There is an effect that the target value can be accurately controlled based on the correlation.
[0022]
According to the fifth aspect of the invention, the configuration is such that the calibration information is output to the control device only when the set load detected to obtain the calibration information is within the predetermined range. There is an effect that writing to a storage medium can be prevented beforehand.
[0023]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described. FIG. 1 shows a hydraulic automatic transmission for a vehicle including a solenoid whose characteristics are corrected in a line process by a characteristic correcting device for a solenoid according to the present invention.
[0024]
In FIG. 1, the torque of an engine 1 mounted on a vehicle (not shown) is transmitted to driving wheels (not shown) via an automatic transmission 2. Note that the automatic transmission 2 may be either a continuously variable transmission or a stepped transmission.
[0025]
Further, a control device 3 (shown as A / TC / U in the figure) for performing a shift control of the automatic transmission 2 incorporates a microcomputer including a CPU, a RAM, a ROM, and the like. By controlling a plurality of solenoids for adjusting the hydraulic pressure for each friction engagement element (clutch, brake, etc.) of the automatic stepped transmission 2, the gear stage is automatically controlled.
[0026]
The control device 3 is mounted as a unit together with the plurality of solenoids in an ATF (automatic transmission oil) atmosphere in a case of the automatic stepped transmission 2 .
[0027]
The solenoid, the plunger (movable iron core) which is biased by a return spring (elastic member), be displaced in the magnetic force against the urging force of the return spring, to change the opening area of the oil path, following what is intended to control the hydraulic pressure supplied to the friction engagement elements, the control device 3 is configured to determine a target hydraulic pressure, the drive current i (operation amount) to be supplied to the solenoids and hydraulic (control amount ), And obtains a drive current i corresponding to the target oil pressure and outputs the same to the solenoid.
[0028]
Here, the there is a variation in the set load of the return spring, based on the correlation variation in correlation (solenoid characteristics) between the current i and the hydraulic by variation in the set load is generated, which is set based on the reference set load of If the drive current i is output in this way, the target hydraulic pressure cannot be obtained with high accuracy.
[0029]
Therefore, in the present embodiment, a process for compensating for the variation in the solenoid characteristics is performed in a line process by the inspection machine 11 as a solenoid characteristic correction device having a configuration as shown in FIG.
[0030]
However, the correction of the variation in the solenoid characteristics is not performed by adjusting the set load to the reference value, but by giving calibration information corresponding to the variation to the control device 3 to estimate the variation as described later. The drive current i is given. Therefore, the solenoid according to the present embodiment is not provided with an adjusting mechanism for adjusting the set load.
[0031]
An A / T unit 6 including a plurality of solenoids 5 to be integrally mounted in a case of the automatic transmission 2 in a later process and the control device 3 is set in the inspection machine 11 shown in FIG. After the inspection process by the inspection machine 11, the A / T unit 6 is mounted in the case of the automatic stepped transmission 2 .
[0032]
The inspection machine 11 is provided with a hydraulic pressure source 12 for supplying a constant hydraulic pressure to each solenoid 5 of the A / T unit 6. The oil whose pressure has been adjusted by each of the solenoids 5 is individually introduced into the inspection machine 11 via the hydraulic pressure inlet 11a, and the adjustment result is adjusted for each solenoid by a hydraulic sensor (not shown) incorporated in the inspection machine 11. Can be detected.
[0033]
Since the characteristic variation of the solenoid 5 is mainly caused by the variation of the set load as described above, in the present embodiment, the solenoid 5 is set on the inspection machine 11 as shown in FIG. Sometimes, the set load of each solenoid 5 is measured, and a comparison between the measurement result and a reference set load stored in advance indicates the correlation between the drive current i and the hydraulic pressure (or flow rate). It is configured to determine calibration information .
[0034]
As shown in FIG. 5 , the solenoid 5 shown in FIG. 3 or FIG. 4 adjusts the hydraulic pressure supplied to the friction engagement element (clutch or the like) 30 of the automatic stepped transmission 2 by the drain of the original pressure. In this configuration, a valve that opens and closes the drain passage 23 is driven to adjust the hydraulic pressure.
[0035]
The solenoid 5 shown in FIG. 3 has a configuration in which a valve (movable iron core) 22 is urged by a return spring 21 in a direction to close a drain path 23 (normally closed type). The valve 22 is displaced upward in the drawing against the urging force of the return spring 21 by the magnetic force of the above, so that the drain passage 23 is opened.
[0036]
When the solenoid 5 is set on the inspection device 11, the tip of the rod 24a of the load sensor 25 contacts the tip of the valve 22 to apply a displacement to the valve 22, and the load corresponding to the displacement is applied to the load sensor 25 ( (Characteristic parameter detecting means) and input to the inspection machine 11.
[0037]
In this case, it is not necessary to supply the hydraulic pressure and the driving current to the solenoid 5, and as shown in the flowchart of FIG. 6 , first, it is determined whether or not the solenoid 5 is set in the inspection machine 11 (step 21). When 5 is set, the set load of each solenoid 5 is measured by the load sensor 25 (step 22: characteristic parameter detecting means), and the measured result is stored in advance as a reference set load (reference value storing means). And the calibration information is calculated by comparing (step 23).
[0038]
Next, it is determined whether or not the measurement result of the set load is within a predetermined range including a reference set load (step 24), and if it is within the predetermined range, a ROM as a storage medium of the control device 3 is used. The control program for the solenoid 5 and the calibration information are simultaneously written into (flash EEPROM) (step 25: calibration information output means).
[0039]
Here, the calibration information can be stored in the control device 3 as a correction amount in the correlation between the drive current and the voltage or the current or the calibrated correlation.
[0040]
In the case shown in FIG. 4 , the solenoid 5 is configured such that a valve (movable iron core) 22 is urged by a return spring 21 in a direction to open a drain path 23 (normally open type). The valve 22 is displaced downward in the figure against the urging force of the return spring 21 by the magnetic force of the coil 24, thereby closing the drain path 23.
[0041]
When the solenoid 5 is set in the inspection machine 11, a maximum current (or a predetermined current) is given to the solenoid 5 to displace the valve 22 downward. The applied load is measured by the load sensor 25 (characteristic parameter detecting means) as an amount equivalent to the set load of the solenoid 5.
[0042]
That is, as shown in the flowchart of FIG. 7 , when it is confirmed that the solenoid 5 is set in the inspection machine 11 (step 31), first, a maximum current (or a predetermined current) is given to the solenoid 5 to open the valve 22. It is displaced downward (step 32).
[0043]
The load at this time is detected by the load sensor 25 as a set load equivalent (step 33), and the detected set load is compared with a previously stored reference value to calculate calibration information (step 33). 34).
[0044]
Here, it is confirmed that the measured load is within a predetermined range including a reference value (step 35), and if it is within the predetermined range, the calibration information is stored in a ROM (flash) as a storage medium of the control device 3. The control program for the solenoid 5 and the calibration information are simultaneously written into an EEPROM (Step 36: calibration information output means).
[0045]
The application of the maximum current in the step 32 may be performed by causing the control device 3 to shift to the calibration mode and being performed by the control device 3 which has received the shift instruction, or the solenoid 5 is directly connected to the inspection device. A configuration may be adopted in which the maximum current is applied from the inspection machine 11 by connecting to the inspection device 11.
[Brief description of the drawings]
FIG. 1 is a diagram showing an automatic transmission for a vehicle including a solenoid whose characteristics are corrected according to the present invention.
FIG. 2 is a diagram showing an inspection machine as a characteristic correction device in the embodiment.
FIG. 3 is a diagram showing a state in which a solenoid is set to an inspection machine according to the first embodiment.
FIG. 4 is a diagram showing a state in which a solenoid is set to an inspection machine according to a second embodiment.
FIG. 5 is a diagram showing an arrangement of a solenoid in an automatic transmission according to the first and second embodiments.
FIG. 6 is a flowchart showing processing contents for characteristic correction in the first embodiment.
FIG. 7 is a flowchart showing processing contents for characteristic correction in the second embodiment.
[Explanation of symbols]
3 ... Control unit 5 ... Solenoid 6 ... A / T unit ... Inspection machine ... Return spring ... Valve ... Drain passage ... Coil ... Load sensor

Claims (5)

A solenoid comprising an elastic member for biasing the movable core,
Characteristic parameter detecting means for detecting a set load of the elastic member as a parameter indicating characteristics of the solenoid ,
Reference value storage means for storing a reference set load in advance;
The set load detected by the characteristic parameter detecting means is compared with a reference set load stored in the reference value storage means to obtain calibration information in controlling the solenoid, and the calibration information is used as a control device of the solenoid. Calibration information output means for writing to a storage medium of
A characteristic correcting device for a solenoid characterized by comprising: 2. The control program according to claim 1 , wherein when the calibration information is written by the calibration information output means to the storage medium of the control device, a control program of the solenoid is simultaneously written to the storage medium. Solenoid characteristic correction device. 3. The solenoid according to claim 1, wherein the calibration information written to the storage medium by the calibration information output unit is a correction amount for correcting a correlation between an operation amount and a control amount of the solenoid. Characteristic correction device. 3. The solenoid characteristic correction device according to claim 1, wherein the calibration information written to the storage medium by the calibration information output unit is a calibrated correlation between an operation amount and a control amount of the solenoid. Only when the set load detected by the characteristic parameter detection means is within a predetermined range including the reference set load stored in the reference value storage means, the calibration information output means writes the calibration information. The solenoid characteristic correcting device according to any one of claims 1 to 4 , wherein the solenoid characteristic correcting device is configured.

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