JPH09100939A - Solenoid proportional valve control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the accuracy of oil pressure supplied to a hydraulic servo, a control oil chamber, and the like. SOLUTION: A solenoid proportional valve control device has a solenoid proportional valve 11 for regulating oil pressure, supplied through an input port, corresponding to an input signal, an actual output pressure supply part 12 disposed in an oil passage L-1 communicated with an output port P2 of the solenoid proportional valve 11, and supplied with actual output pressure changed corresponding to pressure regulation performed by the solenoid proportional valve 11, an actual output pressure detecting means for detecting actual output pressure, and a control device. Oil pressure is regulated by the solenoid proportional valve 11 and supplied as actual output pressure to the actual output pressure supply part 12. The control device has a target output pressure setting means 21 for setting the target output pressure of the solenoid proportional valve 11, a current control means 22 for outputting an input signal to the solenoid proportional valve 11, a comparing means 23 for comparing the target output pressure with the detected actual output pressure, and a correcting means 24 for correcting the target output pressure on the basis of the compared result of the comparing means 23.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid proportional valve control device.

[0002]

2. Description of the Related Art Conventionally, an automatic transmission has a transmission having at least one gear unit,
The gear elements of the gear unit are selectively combined to achieve a plurality of shift stages. for that reason,
A friction engagement element is provided between a specific gear element and a casing, and between specific gear elements, and various gear ratios are set by selectively engaging and disengaging each friction engagement element. You can do it. A hydraulic servo is arranged to engage and disengage the friction engagement elements, and hydraulic pressure is supplied to the hydraulic servo. Further, a control oil chamber is formed at the end of the spool for switching various switching valves, and a signal oil pressure is supplied to the control oil chamber.

By the way, an electromagnetic proportional valve is used for adjusting the hydraulic pressure supplied to the hydraulic servo, control oil chamber, etc. to raise or lower it in a predetermined hydraulic pattern. When the solenoid proportional valve is used, the regulated hydraulic pressure has a characteristic of changing linearly with respect to an input signal. Therefore, the hydraulic pressure supplied to the hydraulic servo, the control oil chamber, etc. can be changed in accordance with the input signal.

[0004]

However, in the above-mentioned conventional solenoid proportional valve control device, the precision of the hydraulic pressure supplied to the hydraulic servo, the control oil chamber, etc. is increased as the control device of the automatic transmission becomes complicated. It becomes difficult to do so, and the cost of the solenoid proportional valve controller increases. That is,
In controlling the hydraulic pressure supplied to the hydraulic servo, control oil chamber, etc., a current is supplied as an input signal to the solenoid of the solenoid proportional valve, and the current is detected to perform feedback control. However, the accuracy of the hydraulic pressure supplied to the hydraulic servo, control oil chamber, etc. greatly depends on the accuracy of the solenoid proportional valve. The standards must be changed to reduce the dimensional error, or to reduce the variation in the components of the material of the component to improve the quality of the component. Therefore, the cost of the solenoid proportional valve control device becomes extremely high.

Further, since the hydraulic pressure output from the solenoid proportional valve always has hysteresis, minute hydraulic pressure control cannot be performed. Further, when the characteristics of the solenoid proportional valve change over time, the hydraulic pressure output from the solenoid proportional valve also changes. Further, when the output from the solenoid proportional valve is supplied to the hydraulic servo via the switching valve, for example, between the valve spool of the switching valve and the valve body of the hydraulic control device in which the valve spool is arranged, or In a case where a sleeve is arranged between the valve spool and the valve body, oil is removed from the minute gaps (clearances) existing between the valve spool and the sleeve and between the sleeve and the valve body. It will leak. In particular, when the oil temperature rises, the viscosity of the oil decreases and the amount of oil leakage increases. When the amount of oil leakage increases, the supply flow capacity of the solenoid proportional valve may be less than the required flow rate (the total flow rate that is the sum of the supply flow rate to the hydraulic servo and the leak rate at the switching valve). Yes, in that case, the hydraulic pressure regulated from the solenoid proportional valve decreases and the actual output pressure also decreases. Further, the engagement pressure control as set in advance cannot be performed, which causes a shift shock or the like.

According to the present invention, the problems of the conventional solenoid proportional valve control device can be solved, the precision of the hydraulic pressure supplied to the hydraulic servo, the control oil chamber, etc. can be increased, and the cost can be reduced. An object of the present invention is to provide an electromagnetic proportional valve control device capable of performing a minute hydraulic control, and in which the output hydraulic pressure does not change even if the characteristics of the electromagnetic proportional valve change over time. And

[0007]

Therefore, in the solenoid proportional valve control device of the present invention, an solenoid proportional valve for adjusting the hydraulic pressure supplied through the input port in accordance with an input signal, and the solenoid proportional valve. And an actual output pressure for detecting the actual output pressure, which is provided in an oil passage communicating with the output port of the It has a detection means and a control device.

The control device sets a target output pressure setting means for setting a target output pressure of the solenoid proportional valve in correspondence with a running state of the vehicle, and an input signal in correspondence with the target output pressure to generate the input signal. Current control means for outputting a signal to the solenoid proportional valve, and comparison means for comparing the target output pressure with the actual output pressure detected by the actual output pressure detecting means,
And a correction unit that corrects the target output pressure based on the comparison result of the comparison unit.

In another solenoid proportional valve control device of the present invention, there is further provided oil temperature detection means for detecting the temperature of the oil supplied to the actual output pressure supply section. Then, the control device includes an actual output pressure correction unit that corrects the actual output pressure detected by the actual output pressure detection unit based on the temperature of the oil detected by the oil temperature detection unit.

Further, the comparison means compares the target output pressure with the corrected actual output pressure.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a conceptual diagram of a solenoid proportional valve control device according to an embodiment of the present invention. In the figure, reference numeral 11 is an electromagnetic proportional valve. The electromagnetic proportional valve 11 regulates the hydraulic pressure supplied via the input port P1 in accordance with an input signal, and outputs the regulated hydraulic pressure from the output port P2. The actual output pressure supply unit 12 is connected to the oil passage L-1 communicating with the output port P2 of the solenoid proportional valve 11.
Is provided, and the actual output pressure supply unit 12 is supplied with the actual output pressure that changes corresponding to the pressure adjustment by the solenoid proportional valve 11.

A pressure sensor 13 as an actual output pressure detecting means is arranged in the oil passage L-1.
The actual output pressure is detected by 3. Reference numeral 15 is an electronic control device as a control device, and the electronic control device 15 corresponds to the running state of the vehicle and the solenoid proportional valve 1
A target output pressure setting means 21 for setting the target output pressure of 1;
Comparison for comparing the target output pressure and the actual output pressure with a current control means 22 for generating an input signal (not shown) corresponding to the target output pressure and outputting the input signal to the solenoid proportional valve 11. Means 23 and correction means 24 for correcting the target output pressure based on the comparison result of the comparison means 23.

FIG. 2 is a schematic diagram of a solenoid proportional valve control device according to an embodiment of the present invention, FIG. 3 is a characteristic diagram of the solenoid proportional valve according to the embodiment of the present invention, and FIG. 4 is a pressure according to the embodiment of the present invention. FIG. 5 is a first characteristic diagram of the sensor, and FIG. 5 is a second characteristic diagram of the pressure sensor in the embodiment of the present invention. In FIG. 3, the horizontal axis represents current, the vertical axis represents regulated hydraulic pressure, and in FIGS. 4 and 5, the horizontal axis represents actual output pressure and the vertical axis represents output voltage.

In FIG. 2, 15 is an electronic control unit, 31
Is a hydraulic control device, and 32 is a running state detecting device for detecting a running state of the vehicle. The running state detecting device 32 detects a throttle opening, a shift position, a brake depression amount, a vehicle speed and the like. The hydraulic pressure control device 31 includes an electromagnetic proportional valve 11, a hydraulic pressure source 33, a control valve 34, and the like, and the hydraulic pressure generated in the hydraulic pressure source 33 is supplied to the electromagnetic proportional valve 11 via an oil passage L-2. Oil passage L
Is supplied to the control valve 34 via -3.

The solenoid proportional valve 11 has a characteristic that the regulated hydraulic pressure changes linearly with respect to a current as an input signal (not shown). Therefore, by adjusting the current supplied to the solenoid (not shown) of the solenoid proportional valve 11, the hydraulic pressure supplied from the hydraulic pressure source 33 is regulated, and the regulated hydraulic pressure is controlled via the oil passage L-4. It can be supplied to the valve 34.
Therefore, the solenoid proportional valve 11 is communicated with the oil passage L-2 via the input port P1 and is communicated with the oil passage L-4 via the output port P2.

The control valve 34 has a control oil chamber at one end of a spool (not shown), and the hydraulic pressure source 3
The oil pressure from 3 is supplied to the control oil chamber as a signal oil pressure,
Move the spool. Then, the control valve 34 controls the hydraulic pressure supplied from the hydraulic pressure source 33, and the controlled hydraulic pressure is supplied to the hydraulic servo 36 as an actual output pressure via the oil passage L-5. As a result, the hydraulic servo 36 disengages the friction engagement element 37 in a pattern corresponding to the actual output pressure.

The hydraulic servo 36 is connected to the actual output pressure supply unit 12 of FIG. 1, and the oil passages L-4 and L-5 are connected to the oil passage L- of FIG.
Equivalent to 1. A pressure sensor 41 as an actual output pressure detecting means and an oil temperature sensor 43 as an oil temperature detecting means are arranged in the oil passage L-5, and the actual output pressure is detected by the pressure sensor 41. The oil temperature sensor 43 detects the temperature of the oil supplied to the hydraulic servo 36 via the oil passage L-5.

In the present embodiment, the hydraulic pressure regulated by the solenoid proportional valve 11 is supplied to the control valve 34, and the hydraulic pressure controlled by the control valve 34 is supplied to the hydraulic servo 36. However, the hydraulic pressure regulated by the solenoid proportional valve 11 can be directly supplied to the hydraulic servo 36. Further, in the present embodiment, the hydraulic servo 36 corresponds to the actual output pressure supply unit 12 of FIG.
It is also possible to make it correspond to the actual output pressure supply unit 12. In that case, only the oil passage L-4 corresponds to the oil passage L-1 in FIG.

Then, the electronic control unit 15 controls the traveling state such as the throttle opening, the shift position, the brake depression amount, the vehicle speed, etc. detected by the traveling state detecting unit 32, and the actual output pressure detected by the pressure sensor 41. , And an electric current is generated based on the oil temperature detected by the oil temperature sensor 43, and the electric current is supplied to the solenoid proportional valve 11 as an input signal.

Therefore, the electronic control unit 15 includes a current control section 42, an output pressure setting section 44, an A / D conversion section 45,
46, 48, a correction unit 47, and a comparison / correction unit 49. Then, in the pressure sensor 41, an output voltage corresponding to the detected actual output pressure is generated, the output voltage is applied to the A / D conversion unit 45, and the A / D conversion unit 4 is generated.
Analog-to-digital conversion by 5 and detection constant D
Becomes 1. On the other hand, in the oil temperature sensor 43, an output voltage corresponding to the detected oil temperature is generated, the output voltage is applied to the A / D conversion unit 46, and the output voltage is output by the A / D conversion unit 46. Is analog / digital converted to oil temperature data. The actual output pressure detected by the pressure sensor 41 and the output voltage output from the pressure sensor 41 have a relationship as shown in FIG.

On the other hand, the traveling states such as the throttle opening, the shift position, the brake depression amount, and the vehicle speed detected by the traveling state detecting device 32 are sent to the electronic control unit 15, respectively. Output pressure setting unit 4 of the electronic control unit 15
When the traveling state is input, 4 sets the target output pressure in accordance with the traveling state. Then, the signal of the target output pressure is sent to the A / D conversion unit 48, and the A / D conversion unit 48
Analog-to-digital conversion by control constant D2
become.

Then, the comparison / correction unit 49 reads the detection constant D1 via the correction unit 47 and compares the control constant D2 with the detection constant D1. In this way,
The target output pressure and the actual output pressure are compared, and the target output pressure is corrected based on the comparison result. The output pressure setting unit 44 is the target output pressure setting unit 21 in FIG. 1, the current control unit 42 is the current control unit 22 in FIG. 1, and the comparison / correction unit 49 is the comparison unit 23 and correction unit in FIG. It corresponds to the means 24.

As described above, the actual output pressure supplied to the hydraulic servo 36 is detected, the target output pressure is compared with the actual output pressure, and the target output pressure is corrected. The accuracy of the solenoid proportional valve 1
There is no need to increase the precision of 1. Therefore, it is not necessary to change the standards of various parts that constitute the solenoid proportional valve 11, and it is not necessary to further reduce the variation in the components of the materials of the parts to further improve the quality of the parts. The cost of the control device can be reduced. Further, even if the actual output pressure has a hysteresis, it can be absorbed, so that minute hydraulic pressure control can be performed.

Further, even if the characteristic of the solenoid proportional valve 11 changes with time, it can be absorbed, so that the actual output pressure can be prevented from changing. Further, when the output from the solenoid proportional valve 11 is supplied to the hydraulic servo 36 via a switching valve (not shown), for example, a small amount existing between the valve spool and the sleeve and between the sleeve and the valve body. The oil leaks from such a gap, resulting in a decrease in the actual output pressure. However, the actual output pressure can be made appropriate by controlling the regulated hydraulic pressure from the solenoid proportional valve 11, so that the actual output pressure does not decrease and a shift shock or the like occurs. Can be prevented.

By the way, in the pressure sensor 41,
As shown in FIG. 5, the output voltage generated corresponding to the actual output pressure changes based on the change in the temperature of the oil supplied from the solenoid proportional valve 11 to the hydraulic servo 36. In FIG. 5, the lines Pa, Pb, Pc, and Pd indicate that the temperature of the oil supplied from the solenoid proportional valve 11 to the hydraulic servo 36 is −40, respectively.
The relationship between the actual output pressure and the output voltage when [° C], +25 [° C], 100 [° C], and 125 [° C] are shown.

As described above, if the temperature of the oil supplied from the solenoid proportional valve 11 to the hydraulic servo 36 changes, the accuracy of the actual output pressure cannot be made sufficiently high. Therefore, in the correction unit 47 as the actual output pressure correction means, the detection constant D1 read from the A / D conversion unit 45 can be corrected based on the oil temperature data.
Therefore, the detected actual output pressure can be corrected based on the temperature of the oil supplied from the solenoid proportional valve 11 to the hydraulic servo 36. In this case, the comparison / correction unit 49 uses the control constant D2 and the corrected detection constant D1.
Compare with

In this way, the detected actual output pressure is corrected based on the oil temperature detected by the oil temperature sensor 43, and the corrected actual output pressure is compared with the target output pressure. Since the current supplied to the solenoid proportional valve 11 can be corrected based on this, the error due to the temperature of the pressure sensor 41 can be corrected. As a result, the accuracy of the actual output pressure can be made sufficiently high.

Next, the operation of the solenoid proportional valve control device having the above construction will be described. FIG. 6 is a flowchart showing the operation of the solenoid proportional valve control device in the embodiment of the present invention. First, the output pressure setting unit 44 (FIG. 2) reads the traveling state detected by the traveling state detection device 32 and sets the target output pressure based on the traveling state. Then, the target output pressure is analog-to-digital converted by the A / D conversion unit 48 to become the control constant D2, and the comparison / correction unit 49
Is read in.

On the other hand, the actual output pressure is detected by the pressure sensor 41, an output voltage is generated, and the output voltage is A /
It is applied to the D conversion unit 45. Then, the A / D conversion unit 45
The output voltage is converted from analog to digital by the output voltage and becomes the detection constant D1. Further, the oil temperature sensor 43 detects the temperature of the oil, an output voltage is generated, and the output voltage is applied to the A / D converter 46. Then, the output voltage is analog-to-digital converted by the A / D converter 46 and becomes oil temperature data.

Next, the correction section 47 reads the detection constant D1 and the oil temperature data, and corrects the detection constant D1 according to the oil temperature data. Further, the comparison / correction unit 49 reads the control constant D2 and the corrected detection constant D1 and compares the control constant D2 with the corrected detection constant D1. If the control constant D2 and the corrected detection constant D1 are not equal, the control constant D2 is corrected so that they are equal.

The control constant D2 thus corrected is input to the current control unit 42, and the current control unit 42 generates a current corresponding to the corrected control constant D2, and the current is fed to the solenoid proportional valve 11. Supply to. Step S1 The output pressure setting unit 44 sets the target output pressure. Step S2 The comparison / correction unit 49 reads the control constant D2 which is analog / digital converted by the A / D conversion unit 48. Step S3 The pressure sensor 41 detects the actual output pressure. Step S4 The oil temperature sensor 43 detects the oil temperature. Step S5 The correction unit 47 corrects the detection constant D1 analog / digital converted by the A / D conversion unit 45 in correspondence with the oil temperature data. Step S6 The comparison / correction unit 49 reads the corrected detection constant D1. Step S7 The comparison / correction unit 49 compares the control constant D2 with the corrected detection constant D1 to determine whether the control constant D2 is equal to the corrected detection constant D1. If the control constant D2 and the corrected detection constant D1 are equal, the process is terminated, and if they are not equal, the process proceeds to step S8. Step S8 The comparison / correction unit 49 corrects the control constant D2, and the process returns to step S2.

The present invention is not limited to the above embodiment, but can be variously modified based on the spirit of the present invention, and these are not excluded from the scope of the present invention.

[0033]

As described in detail above, according to the present invention, in the solenoid proportional valve control device, the solenoid proportional valve for adjusting the hydraulic pressure supplied through the input port in accordance with the input signal, An actual output pressure supply unit, which is provided in an oil passage communicating with the output port of the solenoid proportional valve, supplies the actual output pressure that changes in accordance with the pressure adjustment by the solenoid proportional valve, and detects the actual output pressure. It has an actual output pressure detecting means and a control device.

In this case, the hydraulic pressure supplied through the input port is regulated by the solenoid proportional valve in accordance with the input signal, and the actual output pressure which changes in accordance with the pressure regulated by the solenoid proportional valve is actually output. It is supplied to the pressure supply unit. The control device generates a target output pressure setting means for setting a target output pressure of the solenoid proportional valve in accordance with a running state of a vehicle, and an input signal corresponding to the target output pressure, and outputs the input signal in the above-mentioned manner. Current control means for outputting to the solenoid proportional valve, comparison means for comparing the target output pressure with the actual output pressure detected by the actual output pressure detection means, and the target based on the comparison result of the comparison means. And a correction means for correcting the output pressure.

In this case, in the control device, the target output pressure is set in correspondence with the running state of the vehicle, and the input signal is generated in correspondence with the target output pressure. Further, the target output pressure is compared with the actual output pressure detected by the actual output pressure detecting means, and the target output pressure is corrected based on the comparison result. In this way, the actual output pressure supplied to the actual output pressure supply unit is detected, the target output pressure is compared with the actual output pressure, and the target output pressure is corrected. The accuracy can always be increased, and it is not necessary to increase the accuracy of the solenoid proportional valve.

Therefore, it is not necessary to change the standards of various parts constituting the solenoid proportional valve, and it is not necessary to further reduce the variation in the composition of the material of the parts to further improve the quality of the parts. The cost of the proportional valve control device can be reduced. Further, even if the actual output pressure has a hysteresis, it can be absorbed, so that minute hydraulic pressure control can be performed.

Further, even if the characteristic of the solenoid proportional valve changes with time, it can be absorbed, so that the actual output pressure can be prevented from changing. Further, when the output from the solenoid proportional valve is supplied to the hydraulic servo through, for example, a switching valve, oil is output from minute gaps existing between the valve spool and the sleeve and between the sleeve and the valve body. Leaks, and as a result, the actual output pressure decreases.
However, since the actual output pressure can be made appropriate by controlling the hydraulic pressure regulated by the solenoid proportional valve, the actual output pressure does not decrease and it is possible to prevent a shift shock or the like from occurring. can do.

In another solenoid proportional valve control device of the present invention, there is further provided oil temperature detection means for detecting the temperature of the oil supplied to the actual output pressure supply section. Then, the control device includes an actual output pressure correction unit that corrects the actual output pressure detected by the actual output pressure detection unit based on the temperature of the oil detected by the oil temperature detection unit.

Further, the comparing means compares the target output pressure with the corrected actual output pressure. In this case, the detected actual output pressure is corrected based on the temperature of the oil detected by the oil temperature detection means, the corrected actual output pressure is compared with the target output pressure, and based on the comparison result, Since the input signal can be corrected, the error due to the temperature of the actual output pressure detecting means can be corrected. Therefore,
The accuracy of the actual output pressure can be made sufficiently high.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram of a solenoid proportional valve control device according to an embodiment of the present invention.

FIG. 2 is a schematic diagram of a solenoid proportional valve control device according to an embodiment of the present invention.

FIG. 3 is a characteristic diagram of the solenoid proportional valve according to the embodiment of the present invention.

FIG. 4 is a first pressure sensor according to an embodiment of the present invention.
FIG.

FIG. 5 is a second pressure sensor according to the embodiment of the present invention.
FIG.

FIG. 6 is a flowchart showing an operation of the solenoid proportional valve control device according to the embodiment of the present invention.

[Explanation of reference numerals] 11 solenoid proportional valve 12 actual output pressure supply unit 13, 41 pressure sensor 15 electronic control unit 21 target output pressure setting unit 22 current control unit 23 comparing unit 24 correcting unit 43 oil temperature sensor 47 correcting unit P1 input port P2 output port L-1 oil passage

Claims (2)

[Claims] 1. An electromagnetic proportional valve that adjusts a hydraulic pressure supplied through an input port in accordance with an input signal, and an oil passage that communicates with an output port of the electromagnetic proportional valve. An actual output pressure supply unit that supplies an actual output pressure that changes in accordance with the pressure adjustment, an actual output pressure detection unit that detects the actual output pressure, and a control device, and the control device is provided for the vehicle. Target output pressure setting means for setting the target output pressure of the solenoid proportional valve in correspondence with the running state, and generating an input signal in correspondence with the target output pressure, and outputting the input signal to the solenoid proportional valve. Current control means, comparing means for comparing the target output pressure with the actual output pressure detected by the actual output pressure detecting means, and correcting means for correcting the target output pressure based on the comparison result of the comparing means. A battery characterized by comprising Magnetic proportional valve control device. 2. An oil temperature detecting means for detecting the temperature of the oil supplied to the actual output pressure supply section is provided, and the control device is based on the oil temperature detected by the oil temperature detecting means. The actual output pressure correction means for correcting the actual output pressure detected by the actual output pressure detection means is provided, and the comparison means compares the target output pressure with the corrected actual output pressure. Solenoid proportional valve control device.