KR101870827B1 - An Driving Device with A Programmable Over Driving Circuit - Google Patents

Abstract

The present invention relates to a device to diagnose a short circuit of a variable force solenoid (VFS) and a method thereof, capable of dividing and diagnosing inter-pin short circuit faults of a transmission control circuit and a battery short circuit. According to one embodiment of the present invention, the device to diagnose a short circuit of a VFS comprises: a control unit to apply a driving signal to the VFS; a high side driving unit to transfer the driving signal to the VFS from the control unit; first and second transmission control circuits including a low side driving unit, which includes a current measurement unit measuring a value of current flowing in the VFS to output the measured current value to the control unit; a low side pin signal detection unit to detect an output signal of an output pin connected to the low side driving unit; and a low side monitoring unit connected to the low side pin signal detection unit, monitoring an output signal of an output pin connected to the low side driving unit, and transmitting a timing fault signal to the control unit when timing abnormality is detected. The control unit determines whether an inter-pin short circuit fault occurs in the first and second transmission control circuits based on the timing fault signal.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a variable-power solenoid short-

The present invention relates to variable power solenoid short-circuit diagnosis, and more particularly, to a variable power solenoid short-circuit diagnosis apparatus and method for controlling hydraulic pressure in an automatic transmission.

Variable force solenoid (Variable Force Solenoid) is a device that generates a magnetic field in a cylindrical coil and controls a hydraulic valve. This device is an energy conversion device that converts electrical energy into magnetic energy and then converts it back into mechanical energy. It is currently being applied to systems requiring linear mechanical motion such as valves, switches, and actuators.

With the interest in variable line solenoid valves for vehicle automatic transmissions, line pressure control technology has been actively developed, and variable solenoid valves capable of linearly controlling response characteristics have been actively developed.

Fig. 5 is a variable-power solenoid failure diagnosis circuit diagram of the prior art; Fig.

5, when the control unit 100 applies a control signal to the variable power solenoid 150, the current measuring unit 125 controls the variable power solenoid 150 through the voltage applied to the shunt resistor 124, And feeds the current value to the controller 100. [

At this time, the controller 100 can determine whether the failure has occurred based on the feedback current value. For example, by comparing the feedback current value with the reference current value (s), a short circuit to battery (SCB) failure, a short circuit to ground failure, and an open load have.

However, when a short-circuit between the control pins 126 of the low-side drive part 120 occurs in a plurality of hydraulic valves in the automatic transmission, for example, the solenoid of the high-side drive part 110 of the solenoid adjacent to the short- The short-circuit fault can be diagnosed by the short-circuit of the battery (SCB) or the like due to the detection of the voltage or the like.

According to the present invention, when a pin-to-pin short-circuit failure occurs in the transmission control circuit through the low-side monitoring unit, the pin-to-pin short-circuit failure of the transmission control circuit and the battery short- .

The variable-power solenoid short-circuit diagnosis apparatus according to an embodiment of the present invention includes a controller for applying a drive signal to a variable force solenoid (VFS), a high-side driver for transmitting the drive signal from the controller to the variable- And a current measuring unit for measuring a current flowing through the variable-power solenoid and outputting the current to the control unit, wherein the first and second transmission control circuits each include: A low side pin signal detector for detecting an output signal of an output pin connected to the low side driver; And a low side monitoring unit connected to the low side pin signal detecting unit and monitoring an output signal of an output pin connected to the low side driving unit and transmitting a timing failure signal to the control unit when a timing error is detected, Can determine whether the first and second transmission control circuits are short-circuited to each other based on the timing failure signal.

In this case, the output pin connected to the low-side driving unit may be connected to the first transistor and the current measuring unit connected to the control unit.

The current measuring unit may further include: a shunt resistor connected to the variable power solenoid; And a buffer for outputting a voltage across the shunt resistor to the control unit.

In addition, the low-side pin signal detector may include a voltage divider circuit in which a first resistor and a second resistor are connected in series, and an output of the voltage divider circuit may be applied to the low-side monitoring unit.

When the output signal of the output pin connected to the low-side driving unit of the first transmission control circuit and the output signal of the output pin connected to the low-side driving unit of the second transmission control circuit are the same, the low- A timing detector for detecting timing abnormality; And outputting the timing failure signal to the control unit when the timing abnormality is detected through the timing detection unit.

In addition, the driving signal is PWM (Pulse Width Modulation), and the low-side monitoring unit is connected to the output signal of the output pin connected to the low-side driving unit of the first transmission control circuit and the low- A timing detector for detecting the timing abnormality when the duty ratio of the output signal of the output pin is the same; And outputting the timing failure signal to the control unit when the timing abnormality is detected through the timing detection unit.

When the measured current value measured by the current measuring unit is equal to or greater than the reference current and the timing failure signal is received, the control unit determines whether the first and second transmission control circuits are short- .

In addition, the control unit may be configured to turn off the variable power solenoid when the first and second transmission control circuits are short-circuited to each other.

The variable-power solenoid short-circuit diagnosing method according to an embodiment of the present invention includes a transmission control circuit including a controller, a high-side driver, and a low-side driver, a low-side driver for detecting an output signal of an output pin connected to the low- A method of diagnosing a short-circuit of first and second variable-power solenoids, the method comprising: applying a driving signal to the first and second variable-power solenoids, respectively, in a short-circuit diagnosis apparatus comprising first and second variable-power solenoids each including a signal detection unit and a low-side monitoring unit monitoring a signal of the low- Detecting an output signal of an output pin connected to the low side driver of the first variable power solenoid and an output signal of an output pin connected to the low side driver of the second variable power solenoid; Detecting a timing error between an output signal of an output pin connected to the low side driver of the first variable power solenoid and an output signal of an output pin connected to the low side driver of the second variable power solenoid and outputting a timing failure signal; And determining whether the transmission control circuit is short-circuited to the pin based on the timing failure signal.

In this case, the output pin connected to the low side driver of the first variable power solenoid may be connected to the first transistor and the current measuring unit connected to the control unit.

The method may further include detecting a current value flowing through the first variable power solenoid.

The method may further include discriminating a short circuit between the battery and a pin of the transmission control circuit based on the value of the current flowing through the first variable power solenoid and the timing failure signal.

The step of discriminating the short-circuit between the pins of the transmission control circuit may include detecting a short-circuit fault between the pins of the transmission control circuit when the measured current value measured by the current measuring unit is equal to or greater than a reference current, .

The low-side-pin signal detection unit may include a voltage distribution circuit in which a first resistor and a second resistor are connected in series, and the step of detecting the output signal may include a step of detecting the output of the first variable-power solenoid And detecting an output signal of an output pin connected to the low side driver and an output signal of an output pin connected to the low side driver of the second variable power solenoid.

When the output signal of the output pin connected to the low side driver of the first variable power solenoid and the output signal of the output pin connected to the low side driver of the second variable power solenoid are the same Detecting an abnormality in the timing; And outputting the timing failure signal to the control unit when the timing abnormality is detected.

The output signal of the output pin connected to the low side driver of the first variable power solenoid and the output signal of the output pin connected to the low side driver of the second variable power solenoid may be PWM (Pulse Width Modulation) Detecting the timing abnormality when the duty ratio is the same; And outputting the timing failure signal to the control unit when the timing abnormality is detected.

Further, the control unit may further include a step of turning off the first and second variable power solenoids when the control circuit is in a pin-to-pin short-circuit failure state of the transmission control circuit.

The variable-power solenoid short-circuit diagnosis apparatus according to the present invention as described above can diagnose whether the transmission control circuit is short-circuited to the pin through the low-side monitoring unit. If such a short-circuit fault occurs, the control unit detects short- Diagnosis of battery short-circuit failure can be made. Of course, the scope of the present invention is not limited by these effects.

1 is a circuit diagram of a variable power solenoid short-circuit diagnosis apparatus according to an embodiment of the present invention.
2 is an embodiment of a variable power solenoid short-circuit diagnosis apparatus according to an embodiment of the present invention.
Fig. 3 is a solenoid pulse waveform for erroneously recognizing faults.
4 is a solenoid pulse waveform in which a short circuit occurs.
5 is a circuit diagram of a variable power solenoid failure diagnosis of the prior art.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood, however, that the invention is not limited to the disclosed embodiments, but may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, Is provided to fully inform the user. In addition, for convenience of explanation, components may be exaggerated or reduced in size.

However, it should be understood that the following embodiments are provided so that those skilled in the art will be able to fully understand the present invention, and that various modifications may be made without departing from the scope of the present invention. It is not.

1 is a circuit diagram of a variable power solenoid short-circuit diagnosis apparatus according to an embodiment of the present invention.

Referring to FIG. 1, a variable power solenoid short-circuit diagnosis apparatus according to an embodiment of the present invention may include a transmission control circuit 105, a low-side pin signal detection unit 130, and a low-side monitoring unit 140.

More specifically, the transmission control circuit 105 may include a control unit 100, a high-side driving unit 110, and a low-side driving unit 120.

The control unit 100 may apply a driving signal to the variable power solenoid 150 through the high side driver 110. [ This driving signal may be PWM (Pulse Width Modulation), for example. Here, the drive signal is a control signal input to the variable power solenoid 150 by the control unit 100.

The control unit 100 compares the measured current value measured through the variable force solenoid 150 with the reference current value through the current measuring unit 125 and determines the driving state of the variable power solenoid 150 can do. For example, when the measured current value is about 2A, the control unit 100 can determine that the variable power solenoid 150 is in a driving state, and when the measured current value is about 50 mA, it is in a standby state.

In addition, the controller 100 can determine a failure if the measured current value is less than or equal to the failure reference current value. For example, the controller 100 may diagnose short-circuit to battery (SCB) failure, short circuit to ground failure, and OL (open load) failure according to the measured current value.

If a short-circuit failure occurs in the transmission control circuit 105, the solenoid waveform having a failure after the occurrence of a short-circuit failure can be made to coincide with the adjacent solenoid waveform. At this time, the controller 100 may recognize the short-circuit failure as a battery short- .

In particular, when a short-circuit fault occurs in the transmission control circuit of the solenoid, the voltage of the high-side driving part 110 of the adjacent solenoid is sensed and the short-circuit fault can be erroneously recognized as a short-circuit fault.

At this time, if a short-circuit failure occurs in the transmission control circuit 105, the control unit 100 can be connected to the low-side monitoring unit 140 to distinguish the short-circuit failure between the transmission control circuit pin and the battery short circuit.

More specifically, referring to FIG. 2, the transmission may control the plurality of variable-power solenoid valves VFS1 to VFS6 to be respectively opened and closed. For example, when the driver selects the speed change gear D2, the transmission control circuit 105 controls the valves 2, 4 and 6 to open the valve VFS1 and closes the remaining valves to automatically switch to D2 have.

In this case, each of the variable-power solenoid valves VFS1 to VFS6 can be controlled by a drive signal having a different duty ratio. In this case, the turn-on timing of each of the transistors of the low-side driver 120 may be changed.

In this case, when the solenoid is short-circuited to the transmission control circuit of the transmission control circuit, the same current is applied to the solenoid pins where a short-circuit failure occurs. Therefore, the controller 100 controls the second transistor 122 of the low- the short-circuit failure and the battery short-circuit failure can be distinguished from each other by the difference of the turn-on timing and / or the duty ratio of the variable-power solenoid 150 applied thereto.

The high side driver 110 receives the driving signal of the controller 100 and can transmit the driving signal to the variable power solenoid 150. The high side driver 110 includes a first current flow limiting unit 113, a first transistor 115, 118).

The first transistor 115 is connected to the control unit 100 and can drive the variable power solenoid 150 in response to the driving signal of the control unit 100.

The first control pin 118 is a node connected to the variable power solenoid 150 and the power source VS +.

On the other hand, when the excessive current flows in the first transistor 115, the first current flow restricting unit 113 may limit the current flowing in the solenoid load by controlling the gate voltage of the first transistor 115.

The low side driver 120 may include a current measuring unit 125, a second current flow limiting unit 121, a second transistor 122 and a second control pin 126.

The second control pin 126 is a node connected to the variable power solenoid 150 and the current measuring unit 125. The current measuring unit 125 is connected to the control unit 100 and the current measuring unit 125 is connected to the shunt resistor 124 and the buffer 123. The current measuring unit 125, . ≪ / RTI >

At this time, the current measuring unit 125 measures the voltage applied to the shunt resistor 124, measures the current applied to the current measuring unit 125, and applies the measured current to the controller 100 through the buffer 123.

The low side pin signal detector 130 is connected to the second control pin 126 and includes a voltage divider circuit including a first resistor 133 and a second resistor 135. At this time, the first resistor 133 and the second resistor 135 may be connected in series and the ground may be connected to the second resistor 135. The output of the voltage divider circuit may be transmitted to the low side monitoring unit 140.

The low side monitoring unit 140 may include a timing detection unit 143 and a failure determination unit 145.

When a timing error occurs in the signal output from the low side pin signal detector 130, the timing detector 143 recognizes the timing error as an event and can confirm the timing of occurrence of the event.

Here, the failure determination unit 145 recognizes that a failure occurs in the transmission control pin short-circuit due to the timing determined by the timing detection unit 143, transmits a failure signal to the control unit 100, Faults can be identified and faults can be determined.

Meanwhile, the input of the low side monitoring unit 140 may be configured by the number of circuits of the variable power solenoid 150.

2 and 3, during operation of the first solenoid 150, the second solenoid 160 and the third solenoid 170, the second solenoid 160 and the transmission control circuit of the third solenoid 170, The control unit 100 can recognize the short circuit between the transmission control circuit pins based on the current value applied from the current measuring unit 125 and the input signal of the low side monitoring unit 140. [ At this time, the controller 100 corresponding to the second solenoid 160 may turn off the second transistor 122 at the time of fault recognition. According to the prior art, in this case, the control unit 100 misdiagnosed as a battery short circuit (SCB) because it could not recognize the transmission control circuit pin short-circuit.

More specifically, when the transmission control circuit short-circuit fault 310 between the second solenoid 160 and the third solenoid 170 occurs, the low-side pin signal detection unit 310 detects a short- The output waveform 320 of the output buffer 130 may be the same. That is, when such a short circuit occurs, since the waveform may be formed along the channel where the level switching of the high side driving unit is performed first, the low side monitoring unit 140 of the second solenoid 160 and the third solenoid 170, The waveforms 320 of the output signals of the first and second input /

3 and FIG. 4, the waveform of the solenoid in the steady state is indicated by a dotted line. In order to explain that the output waveform 320 of the low side-pin signal detector 130 having the short circuit coincides with each other, The output waveform 320 of the matching low side signal detector 130 is shown by a solid line.

4 is a pulse waveform of an output signal of the low side monitoring unit 140 when a short-circuit between the transmission control circuit pins occurs.

Referring to FIG. 4, when a short circuit occurs between the first solenoid 150 and the second solenoid 160, the controller 100 controls the first solenoid 150 and the second solenoid 160 ) Is not recognized even though the waveform of the battery is in agreement, and it is recognized that the battery is short-circuited.

In this case, the control unit 100 determines that the battery is short-circuited, and turns off all the solenoids including the third solenoid 170 and the fourth solenoid 180.

Accordingly, the present invention detects a signal of the low side driver 120 through the low side pin signal detector 130 and transmits the signal to the low side monitoring unit 140. The low side monitoring unit 140 monitors the transmission control pin short- , It is possible to distinguish between short-circuit failure and battery short-circuit failure.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, Various substitutions, modifications, and variations are possible without departing from the scope of the invention. Accordingly, the scope of the present invention should be construed as being limited to the embodiments described, and it is intended that the scope of the present invention encompasses not only the following claims, but also equivalents thereto.

100:
110: High side driver
120: current measuring unit
130: Low side driver
150: Low side pin signal detection unit
160: Low side monitoring unit
170: variable power solenoid

Claims (17)

A control unit for applying a driving signal to a variable force solenoid (VFS), a high side driving unit for transmitting the driving signal from the control unit to the variable power solenoid, and a controller for measuring a current value flowing through the variable power solenoid, First and second transmission control circuits each including a low-side driving section having a current measuring section for outputting a current;
A low side pin signal detector for detecting an output signal of an output pin connected to the low side driver; And
A low side monitoring unit connected to the low side pin signal detecting unit and monitoring an output signal of an output pin connected to the low side driving unit and transmitting a timing failure signal to the control unit when a timing error is detected,
Wherein the control unit determines whether or not the first and second transmission control circuits are short-circuited to each other based on the timing failure signal,
Wherein the control unit distinguishes between a pin short-circuit fault and a battery short-circuit fault in the first and second transmission control circuits when the measured current value measured by the current measuring unit is equal to or greater than a reference current and the timing failure signal is received ,
Variable-power solenoid short-circuit diagnostics.
The method according to claim 1,
An output pin connected to the low side driver is connected to the first transistor connected to the control unit and the current measuring unit,
Variable-power solenoid short-circuit diagnostics.
The method according to claim 1,
The current measuring unit includes:
A shunt resistor connected to the variable power solenoid; And
And a buffer for outputting a voltage across the shunt resistor to the control unit.
Variable-power solenoid short-circuit diagnostics.
The method according to claim 1,
Wherein the low-side pin signal detecting unit includes a voltage dividing circuit in which a first resistor and a second resistor are connected in series, and the output of the voltage dividing circuit is applied to the low-
Variable-power solenoid short-circuit diagnostics.
The method according to claim 1,
The low-
A timing detector for detecting the timing error when the output signal of the output pin connected to the low side driver of the first transmission control circuit is the same as the output signal of the output pin connected to the low side driver of the second transmission control circuit; And
And outputting the timing failure signal to the control unit when the timing abnormality is detected through the timing detection unit,
Variable-power solenoid short-circuit diagnostics.
The method according to claim 1,
Wherein the driving signal is PWM (Pulse Width Modulation), and the low-side monitoring unit monitors the output signal of the output pin connected to the low-side driving unit of the first transmission control circuit and the output signal of the output pin connected to the low- A timing detector for detecting an abnormality in the timing when the duty ratio of the output signal of the timing generator is the same; And
And outputting the timing failure signal to the control unit when the timing abnormality is detected through the timing detection unit,
Variable-power solenoid short-circuit diagnostics.
delete The method according to claim 1,
Wherein the control unit is configured to turn off the variable power solenoid in the event of a pin to pin short-circuit failure of the first and second transmission control circuits,
Variable-power solenoid short-circuit diagnostics.
A low-side pin signal detector for detecting an output signal of an output pin connected to the low-side driver, and a low-side monitor for monitoring a signal of the low-side driver, the transmission control circuit including a control unit, a high-side driving unit and a low- In the short-circuit diagnosis apparatus of the first and second variable power solenoids,
Applying a driving signal to the first and second variable power solenoids;
Detecting an output signal of an output pin connected to the low side driver of the first variable power solenoid and an output signal of an output pin connected to the low side driver of the second variable power solenoid;
Detecting a timing error between an output signal of an output pin connected to the low side driver of the first variable power solenoid and an output signal of an output pin connected to the low side driver of the second variable power solenoid and outputting a timing failure signal;
Determining whether the transmission control circuit is short-circuited to the pin based on the timing failure signal; And
Detecting a current value flowing through the first variable power solenoid and distinguishing a short circuit between the battery and a pin of the transmission control circuit based on the current value flowing through the first variable power solenoid and the timing failure signal;
Variable force solenoid short circuit diagnosis method.
10. The method of claim 9,
An output pin connected to the low side driver of the first variable power solenoid is connected to the first transistor and the current measuring unit connected to the control unit,
Variable force solenoid short circuit diagnosis method.
delete delete 11. The method of claim 10,
Wherein the step of discriminating the short-circuit between pins of the transmission control circuit comprises the steps of diagnosing a pin-to-pin short-circuit failure of the transmission control circuit when the measured current value measured by the current measuring unit is equal to or greater than a reference current and the timing failure signal is applied thereto / RTI >
Variable force solenoid short circuit diagnosis method.
10. The method of claim 9,
Wherein the low side pin signal detecting unit includes a voltage dividing circuit in which a first resistor and a second resistor are connected in series,
Wherein the step of detecting the output signal comprises the step of detecting the output signal of the output pin connected to the low side drive part of the first variable power solenoid and the output of the output pin connected to the low side drive part of the second variable power solenoid based on the output of the voltage divider circuit Comprising: detecting a signal;
Variable force solenoid short circuit diagnosis method.
10. The method of claim 9,
Wherein when the output signal of the output pin connected to the low side driver of the first variable power solenoid and the output signal of the output pin connected to the low side driver of the second variable power solenoid are the same, Detecting the timing abnormality; And
And outputting the timing failure signal to the control unit when detecting the timing abnormality.
Variable force solenoid short circuit diagnosis method.
10. The method of claim 9,
The driving signal is PWM (Pulse Width Modulation)
Detecting the timing abnormality when the duty ratio of the output signal of the output pin connected to the low side driver of the first variable power solenoid and the output signal of the output pin connected to the low side driver of the second variable power solenoid are the same ; And
And outputting the timing failure signal to the control unit when detecting the timing abnormality.
Variable force solenoid short circuit diagnosis method.
17. The method of claim 16,
Further comprising turning off the first and second variable power solenoids when the control unit is in a pin-to-pin short-circuit fault state of the transmission control circuit.
Variable force solenoid short circuit diagnosis method.

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