KR20170069017A - Fault Diagnosis Method for Solenoid Valve And Device thereof - Google Patents

Fault Diagnosis Method for Solenoid Valve And Device thereof Download PDF

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Publication number
KR20170069017A
KR20170069017A KR1020150176185A KR20150176185A KR20170069017A KR 20170069017 A KR20170069017 A KR 20170069017A KR 1020150176185 A KR1020150176185 A KR 1020150176185A KR 20150176185 A KR20150176185 A KR 20150176185A KR 20170069017 A KR20170069017 A KR 20170069017A
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KR
South Korea
Prior art keywords
solenoid valve
overcurrent
voltage
high side
low side
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KR1020150176185A
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Korean (ko)
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KR101836151B1 (en
Inventor
이시광
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현대오트론 주식회사
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Priority to KR1020150176185A priority Critical patent/KR101836151B1/en
Publication of KR20170069017A publication Critical patent/KR20170069017A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G01R19/16533—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application
    • G01R19/16538—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies
    • G01R19/16542—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies for batteries
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
    • G01R31/024—
    • G01R31/3624—

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Power Engineering (AREA)
  • Magnetically Actuated Valves (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Abstract

The present invention relates to a method of diagnosing a malfunction of a solenoid valve applied to an injector, and more particularly, to a method of diagnosing a malfunction of a solenoid valve applied to an injector, And an apparatus for performing the method.

Description

Technical Field [0001] The present invention relates to a solenoid valve,

The present invention relates to a method of diagnosing a malfunction of a solenoid valve applied to an injector, and more particularly, to a method of diagnosing a malfunction of a solenoid valve applied to an injector, And an apparatus for performing the method.

The contents described in this section merely provide background information on the embodiment of the present invention and do not constitute the prior art.

Generally, an injector is a fuel injection device mounted on an engine cylinder head of a vehicle to inject fuel into a combustion chamber, and the GDI injector is a fuel injection device in a manner of injecting fuel directly into a combustion chamber of a cylinder.

The injector of an internal combustion engine for a vehicle injects a fuel whose discharge amount or the like is controlled by a control of an electronic control unit (ECU) of a vehicle. The structure of such an electronically controlled injector is generally set in a housing, a housing A solenoid coil magnetized by a control signal of the electronic control unit, an armature moving up and down by the magnetization of the solenoid coil, and a needle vertically moving together with the armature connected to the armature, And a valve seat having a valve hole formed therein is coupled to the bottom surface of the housing so that the valve hole of the valve seat is opened and closed by the upward and downward movement of the ball valve.

The fuel injection amount is determined by the opening time of the needle, that is, the energization time of the solenoid coil.

An example of the operation of a solenoid valve applied to a conventional GDI injector is control of its operation in such a manner that the battery voltage is supplied at the high side and the control signal is transmitted at the low side.

However, in the conventional solenoid valve having the above-described operation method, there is no technique for diagnosing a failure such as short-circuiting disconnection of various electric elements when the injector is driven. Therefore, when such a failure occurs, have.

In particular, it is necessary to research and develop hardware and software design to detect when a short circuit of the battery occurs simultaneously at the high side and the low side, or when a short circuit occurs at the high side and the low side simultaneously when the injector is driven.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a fuel cell system and a fuel cell system in which when a short circuit of a battery occurs at a high side and a low side at the time of driving an injector, And a detection system for detecting a short fault occurring at the same time and a detection system capable of applying the corresponding detection method.

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

In order to achieve the above-mentioned object, one aspect of the present invention provides a power supply apparatus comprising: a power supply; A plurality of solenoid valves operable to receive power from the power supply unit, the solenoid valves common to the high side and the low side individually;

A bias power supply for supplying a bias voltage to the solenoid valve even when the power supply unit does not supply power; A high side overcurrent judging unit for judging whether the overcurrent flows by measuring the high side current of the solenoid valve;

A high side voltage measuring unit for measuring a high side voltage of the solenoid valve; A plurality of low side voltage measurement units for measuring a low side voltage of each of the solenoid valves; And

And a low side overcurrent judging unit for judging whether an overcurrent flows by measuring a current of the low side of each of the solenoid valves.

The power supply unit may include a battery voltage supply unit and a boost voltage supply unit.

The bias power supply unit may include two resistance elements having the same value.

The high side overcurrent determining section may have a first voltage comparison determining section for determining the overcurrent when the voltage value across the first shunt resistor and the first shunt resistor is greater than the first threshold voltage,

The low side overcurrent determining unit may have a second voltage comparison determining unit that determines the overcurrent when the voltage applied to the second shunt resistor and the second shunt resistor is greater than the second threshold voltage.

The first threshold voltage may be set to be larger than the second threshold voltage so that the low side overcurrent determination unit operates earlier than the high side overcurrent determination unit.

The above-described solenoid valve may be applied to a direct injection injector (GDI) for a vehicle.

According to another aspect of the present invention, there is provided a plasma display apparatus comprising: a bias voltage supplying step of supplying a bias voltage to each of a plurality of solenoid valves connected in common in an idle state and a low side in common;

A malfunction determining step of monitoring the high side of the solenoid valve in the idle state to determine whether or not the malfunction is a fault based on the bias voltage; And

Wherein when a failure is determined in the failure determination step, a first solenoid valve and a second solenoid valve are sequentially operated among the plurality of solenoid valves, and it is determined whether or not an overcurrent exists and a simultaneous short- And a failure determination step of determining a failure of the solenoid valve.

And the malfunction determination step may be characterized by determining that the malfunction is occurred when the voltages of the high side are all lower than the first reference voltage.

The first reference voltage may be a value obtained by subtracting the set voltage from the bias voltage.

And the failure determination step may be characterized in that, when the voltage of the high side is higher than the second reference voltage, it is determined that the failure has occurred.

And the second reference voltage may be a value obtained by adding the set voltage at the bias voltage.

A first overcurrent determining step of operating the first solenoid valve and determining whether the first solenoid valve in operation is overcurrent when it is determined in the failure determination step that the simultaneous short failure is determined; And

A second overcurrent determining step of determining whether the overcurrent of the second solenoid valve is in operation when the overcurrent is determined in the first overcurrent determination step; stopping the operation of the first solenoid valve in operation and operating the second solenoid valve; An overcurrent determination step;

And a control unit.

Wherein the first overcurrent determining step monitors the low side of the first solenoid valve to determine whether the overcurrent flows,

And the second overcurrent determining step may determine whether the overcurrent flows by monitoring the high side of the second solenoid valve.

Wherein the second overcurrent determining step determines whether the overcurrent is present by monitoring the high side of the first solenoid valve in operation when the overcurrent is not determined in the first overcurrent determination step, The second solenoid valve is operated and the low side of the second solenoid valve in operation is monitored to determine whether or not the overcurrent flows.

According to another aspect of the present invention, there is provided a plasma display apparatus comprising: a bias voltage supplying step of supplying a bias voltage to each of a plurality of solenoid valves individually connected to a high side in an idle state and a low side in common;

A malfunction determining step of monitoring the high side of the solenoid valve in the idle state to determine whether or not the malfunction is a fault based on the bias voltage;

A first overcurrent determining step of operating the first solenoid valve among the plurality of solenoid valves and monitoring the low side of the first solenoid valve in operation when it is determined as a failure in the failure determination step; And

Wherein when the overcurrent is determined in the first overcurrent determining step, the operation of the first solenoid valve in operation is stopped, the second solenoid valve different from the first solenoid valve is operated among the plurality of solenoid valves, The high side of the second solenoid valve is monitored to determine whether or not an overcurrent exists,

Wherein the first solenoid valve is operable to stop the first solenoid valve if it is determined that the first overcurrent is not overcurrent, And a second overcurrent determining step of operating the second solenoid valve and monitoring the low side of the second solenoid valve in operation to determine whether or not the overcurrent flows through the solenoid valve.

The above-described solenoid valve may be applied to a direct injection injector (GDI) for a vehicle.

As described above, according to an embodiment of the present invention, when a battery short fault occurs simultaneously at the high side and the low side when the injector is driven, or when a ground short fault occurs simultaneously at the high side and the low side, And a detection system capable of applying the detection technique can be provided.

In addition, the effects of the present invention have various effects such as excellent general versatility according to the embodiments, and such effects can be clearly confirmed in the description of the embodiments described later.

1 shows an embodiment of a fault diagnosis system for a solenoid valve according to the present invention.
2 is a block diagram illustrating a method for diagnosing a failure of a solenoid valve according to an embodiment of the present invention.
3 is a block diagram showing detailed steps of the simultaneous short fault determination step.
4 is a flowchart showing a first embodiment of a method for diagnosing a trouble of the solenoid valve of Figs. 2 and 3. Fig.
Fig. 5 is a flowchart showing a second embodiment of the method for diagnosing a fault of the solenoid valve of Figs. 2 and 3. Fig.
6 is a block diagram showing a third embodiment of a method for diagnosing a failure of a solenoid valve according to the present invention.

Hereinafter, an embodiment of the present invention will be described in detail with reference to exemplary drawings.

It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference symbols as possible even if they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In addition, the size and shape of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, terms specifically defined in consideration of the constitution and operation of the present invention are only for explaining the embodiments of the present invention, and do not limit the scope of the present invention.

First, an embodiment of the present invention will be described as follows. Invention

1 shows an embodiment of a fault diagnosis system for a solenoid valve according to the present invention. 1 (b) is a circuit diagram for setting a first threshold voltage, and FIG. 1 (c) is a diagram for explaining an example of setting a second threshold voltage Fig.

The fault diagnosis system 100 of the solenoid valve 120 according to the present embodiment includes a power supply unit 110; A plurality of solenoid valves 120 that are operated by receiving power from the power supply unit 110, the solenoid valves 120 common to the high side and the low side individually;

A bias power supply 130 for supplying a bias voltage Bias to the solenoid valve 120 even when the power supply unit 110 does not supply power; A high side overcurrent judging unit (140) for measuring the high side current of the solenoid valve (120) to judge whether an overcurrent exists;

A high side voltage measurement unit for measuring a high side voltage (HFV) of the solenoid valve 120; A plurality of low side voltage measurement units for measuring low side voltages LFV # 1 and LFV # 2 of the respective solenoid valves 120; And

And a low side overcurrent judging unit 150 for judging whether an overcurrent flows by measuring a current of the low side of each of the solenoid valves.

Here, the solenoid valve 120 may be applied to a direct injection injector (GDI) for a vehicle.

According to an embodiment, the high-side overcurrent determining unit 140 may have a first voltage comparison determining unit that determines the overcurrent when the voltage value across the first shunt resistor and the first shunt resistor is greater than the first threshold voltage,

The low side overcurrent judging unit 150 may have a second voltage comparing and judging unit for judging the overcurrent when the voltage applied to the second shunt resistor and the second shunt resistor is larger than the second threshold voltage.

Here, the first threshold voltage may be set to be greater than the second threshold voltage so that the low side overcurrent determining unit 150 operates before the high side overcurrent determining unit 140.

Hereinafter, the fault diagnosis system 100 of the solenoid valve 120 according to the present embodiment will be described in detail. According to an embodiment, the power supply unit 110 may include a boost voltage supply unit and a battery voltage supply unit.

According to an embodiment, the boost voltage supply may include a boost switch, a first switch 111 connected between the boost power supply, the boost power supply and the high side of the solenoid valve 120, and the first switch 111 on the high side of the solenoid valve 120 When the switch 111 is turned on, the solenoid valve 120 can start driving by receiving a boost power of, for example, 65V.

According to an embodiment, the battery voltage supplier may include a second switch 112 connected between the battery power source and the battery power source and the high side of the solenoid valve 120, When the switch 112 is turned on, the solenoid valve 120 can be powered by the battery power.

When the boost voltage is applied to the solenoid valve 120 for a predetermined time and the drive voltage rises to a certain level, the first switch 111 is turned off and the second switch 112 is turned on. (120) is driven and controlled to the battery voltage (VBAT).

The bias power supply 130 may include a structure in which two resistance elements R3 and R4 having the same value are connected in series and a battery voltage VBAT may be connected to the resistance element R3, The bias voltage Bias can be supplied to the solenoid valve 120 even before the battery voltage VBAT is supplied.

According to an embodiment, a high side voltage measuring unit may be connected to the high side of the solenoid valve 120, and a low side voltage measuring unit may be connected to the low side. One end of the third switch 113 and one end of the fourth switch 114 may be connected to the low side of each of the solenoid valves 120 according to the embodiment.

 The high side overcurrent judging unit 140 includes a first shunt resistor Rl provided between the boost voltage supply unit of the high side and the battery voltage supply unit and a second shunt resistor R1 between the boost voltage supply unit and the battery voltage supply unit to measure the overcurrent flowing on the high side of the solenoid valve 120 And a first voltage comparison / determination section for determining the overcurrent when the voltage value applied to the first shunt resistor R1 is larger than the first threshold voltage (Threshold V1).

Here, the first voltage comparison / determination section may include two OP-amplifier elements and two resistance elements R5 and R6. Meanwhile, the first threshold voltage V1 may be determined by two resistive elements R5 and R6 connected in series, and the user may arbitrarily set the resistive elements R5 and R6.

The low side overcurrent determining unit 150 includes a second shunt resistor R2 commonly provided at the other end of the third switch 113 and the fourth switch 114 on the low side, And a second voltage comparing and judging section for judging the overcurrent when the voltage value applied to the second shunt resistor (R2) is larger than the second threshold voltage (Threshold V2) in order to measure an overcurrent flowing on the high side of the valve (120) .

Here, the second voltage comparison / determination section may include two OP-amplifier elements and two resistance elements R7 and R8. The second threshold voltage V2 may be determined by two resistive elements R7 and R8 connected in series and may be arbitrarily set by the user by adjusting the resistance elements R7 and R8.

It is also preferable that the first threshold voltage V1 is sufficiently larger than the second threshold voltage V2. The LFSV signal must be set to, for example, 1 before the HFSV signal when the same current flows so that the low side overcurrent determining unit 150 operates before the high side overcurrent determining unit 140. [

The high-side voltage measurement unit and the low-side voltage measurement unit may be configured to monitor the voltage, and the high-side overcurrent determination unit 140 and the low-side overcurrent determination unit 150 may be configured to monitor the current. That is, the overcurrent determining unit 140, 150 may be a configuration for monitoring the voltage to detect how much current flows.

Hereinafter, a method for performing the failure diagnosis of the solenoid valve 120 by the failure diagnosis system 100 of the solenoid valve 120 having the above-described configuration will be described. However, an embodiment of the method of diagnosing the solenoid valve 120 according to the present invention to be described later can not be performed only by the failure diagnosis system 100 of the solenoid valve 120 described above.

FIG. 2 is a block diagram illustrating a method for diagnosing a failure of a solenoid valve according to an embodiment of the present invention, and FIG. 3 is a block diagram illustrating detailed steps of a simultaneous short failure determination step.

A method of diagnosing a solenoid valve 120 according to the present invention is characterized in that the high side is common in an idle state and the low side is a bias voltage supply for supplying a bias voltage Bias to each of a plurality of solenoid valves 120 individually connected Step SlOO;

A failure determination step (S110) of monitoring the high side of the solenoid valve (120) in the idle state to determine whether or not the failure is based on the bias voltage (Bias); And

If it is determined in step S110 that the failure has occurred, the first solenoid valve 121 and the second solenoid valve 122 are sequentially operated among the plurality of solenoid valves 120, And a low-side simultaneous short-circuit failure determination step (S120).

According to the embodiment, in the failure determination step (S110), when all of the voltages of the high side are lower than the first reference voltage, it can be determined as failure. The first reference voltage may be a value obtained by subtracting the set voltage from the bias voltage Bias.

According to the embodiment, in the failure determination step (S110), when all the voltages of the high side are higher than the second reference voltage, the failure determination step (S110) can determine that the failure is a failure. Here, the second reference voltage may be a value obtained by adding the set voltage to the bias voltage Bias.

If it is determined in step S110 that the failure has occurred in the failure determination step S120, the simultaneous short failure determination step S120 may operate the first solenoid valve 121 and cause the overcurrent of the first solenoid valve 121 in operation A first overcurrent determining step (S121) for determining whether or not the first overcurrent is determined; And

If it is determined in the first overcurrent determination step S121 that the overcurrent is determined, the operation of the first solenoid valve 121 in operation is stopped, the second solenoid valve 122 is operated, And a second overcurrent determination step (S122) for determining whether the valve 122 is over-current. The first overcurrent determining step S121 determines whether or not an overcurrent exists by monitoring the low side of the first solenoid valve 121. The second overcurrent determining step S122 determines whether or not the overcurrent of the second solenoid valve 122 The high side can be monitored to determine whether an over current is present.

If the overcurrent is not determined in the first overcurrent determining step S121, the second overcurrent determining step S122 determines whether the overcurrent flows by monitoring the high side of the first solenoid valve 121 in operation, If it is determined to be an overcurrent, the operation of the first solenoid valve 121 is stopped, the second solenoid valve 122 is operated, and the low side of the second solenoid valve 122 in operation is monitored, .

Here, the bias voltage Bias is constituted by two resistance elements R3 and R4. When the two resistance elements R3 and R4 have the same value, the bias voltage Bias becomes equal to the battery voltage VBAT / 2 And the first reference voltage may be a value obtained by subtracting the set voltage from the bias voltage Bias. The second reference voltage may be a value obtained by adding the set voltage to the bias voltage (Bias). Referring to FIG. 3, the set voltage is 1V. The first reference voltage and the second reference voltage may be applied to both the first and second embodiments of the present invention to be described later.

4 is a flowchart showing a first embodiment of a method for diagnosing a trouble of the solenoid valve of Figs. 2 and 3. Fig. 4, the first solenoid valve 121 is denoted by a first injector # 1, and the second solenoid valve 122 is denoted by a second injector # 2.

The method for diagnosing a malfunction of the solenoid valve 120 according to the present embodiment starts by generating a bias voltage Bias in a state where all the switches of the solenoid valve 120 are turned off, that is, in an idle state and supplies them to the solenoid valve 120 S100), and monitors the high side of the solenoid valve 120.

As a result of the monitoring, it is determined whether or not the high side of the solenoid valve 120 is lower than the first reference voltage (Bias-1V). If such a case is not detected, ).

However, if such a case is detected, it is determined as a failure, and the first solenoid valve 121 is operated among the plurality of solenoid valves 120 (S120). And detects whether an overcurrent flows in the low side of the first solenoid valve 121 that operates. If the set value of the LFSV signal is greater than 0 (LFVS > 0), it can be determined that the overcurrent is low-side depending on the embodiment (S121).

When it is determined that the overcurrent flows in the low side (S121), the operation of the first solenoid valve 121 is stopped and the second solenoid valve 122 is operated. And detects whether an overcurrent flows on the high side of the second solenoid valve 122 that operates. According to the embodiment, when the set value of the HFSV signal is larger than 0 (HFVS > 0), it can be judged as a high side overcurrent.

In this way, it is possible to determine that a short-to-ground fault has occurred at both the high and low sides of the first solenoid valve 121. If it is determined that a short-to-GND fault has occurred, The operation of the valve 121 is stopped.

On the other hand, whether or not an overcurrent flows in the low side of the first solenoid valve 121 is detected (S121). And detects whether an overcurrent flows on the high side of the first solenoid valve 121 that operates when an overcurrent is not detected. That is, it is first detected whether an overcurrent flows in the low side and then whether an overcurrent flows in the high side. According to the embodiment, when the set value of the HFSV signal is larger than 0 (HFVS > 0), it can be judged as a high side overcurrent.

When it is determined that an overcurrent flows on the high side of the first solenoid valve 121 to be operated, the operation of the first solenoid valve 121 is stopped and the second solenoid valve 122 is operated. And detects whether an overcurrent flows in the low side of the second solenoid valve 122 that operates. According to an embodiment, it can be determined that the overcurrent of the low side when the set value of the LFSV signal is larger than 0 (LFVS > 0).

By this process, it can be determined that a short-to-ground fault has occurred simultaneously at the high side and the low side of the second solenoid valve 122. If it is determined that a short-to-GND fault has occurred, The operation of the valve 122 is stopped.

Fig. 5 is a flowchart showing a second embodiment of the method for diagnosing a fault of the solenoid valve of Figs. 2 and 3. Fig. 5, the first solenoid valve 121 is indicated as a first injector # 1, and the second solenoid valve 122 is designated as a second injector # 2 as in FIG.

The first embodiment and the second embodiment of the method for diagnosing a fault of the solenoid valve 120 according to the present invention differ from the criterion for determining a failure in the failure determination step (S110). 4 and 5, in the case of the first embodiment, it is determined that a failure occurs when the high-side voltage HFV is lower than the first reference voltage Bias-1V, and in the case of the second embodiment Is judged as a failure when the voltage (HFV) at the high side is higher than the second reference voltage (Bias + 1V).

The first and second embodiments of the method for diagnosing a fault of the solenoid valve 120 according to the present invention differ in the types of faults to be diagnosed. That is, in the case of the first embodiment, it is detected that a short short GND occurs at the high side and the low side of the first solenoid valve 121 or the second solenoid valve 122 at the same time, In the case of the embodiment, it is detected that a short to battery occurs at the high side and the low side of the first solenoid valve 121 or the second solenoid valve 122 at the same time.

Therefore, the second embodiment only describes the differences from the first embodiment, and the common points are replaced with the description of the first embodiment.

The method for diagnosing a malfunction of the solenoid valve 120 according to the second embodiment of the present invention starts by generating a bias voltage Bias in a state where all the switches of the solenoid valve 120 are turned off, (S100), and monitors the high side of the solenoid valve 120 (S100).

If it is determined that the high side of the solenoid valve 120 is higher than the second reference voltage (Bias + 1V) as a result of monitoring, it is determined that the failure is not a failure (No Fault) ).

However, if such a case is detected, it is determined as a failure, and the first solenoid valve 121 is operated among the plurality of solenoid valves 120 (S120). The following procedure is the same as that of the first embodiment. Eventually, a short-to-battery fault occurs simultaneously at the high side and the low side of the first solenoid valve 121 or the second solenoid valve 122, If it is determined that a failure has occurred, the failure is recorded and the operation of the first solenoid valve 121 or the second solenoid valve 122 is stopped.

6 is a block diagram showing a third embodiment of a method for diagnosing a failure of a solenoid valve according to the present invention.

The method for diagnosing the solenoid valve 120 according to the present embodiment is characterized in that the high side is common in the idle state and the low side is the bias voltage (bias voltage) for supplying the bias voltage Bias to each of the plurality of solenoid valves 120 individually connected Supply step S200;

A failure determination step (S210) of monitoring the high side of the solenoid valve (120) in the idle state to determine whether or not the failure is based on the bias voltage (Bias);

If it is determined in step S210 that the failure has occurred, the first solenoid valve 121 is operated among the plurality of solenoid valves 120, and the low side of the first solenoid valve 121 in operation is monitored A first overcurrent judging step (S220) for judging whether or not an overcurrent flows; And

If it is determined in the first overcurrent determining step S220 that the overcurrent is present, the operation of the first solenoid valve 121 in operation is stopped, and the first solenoid valve 121 and the second solenoid valve 120 The second solenoid valve 122 is operated and the high side of the second solenoid valve 122 in operation is monitored to determine whether or not an overcurrent exists,

If the overcurrent is not determined in the first overcurrent determination step S220, it is determined whether the overcurrent flows by monitoring the high side of the first solenoid valve 121 in operation. If the overcurrent is determined, the first solenoid valve 121 A second overcurrent determination step (S230) for stopping the operation of the second solenoid valve (121), operating the second solenoid valve (122), and monitoring the low side of the operating second solenoid valve (122) As shown in FIG.

The above description is only illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention.

The embodiments disclosed in the present invention are not intended to limit the scope of the present invention and are not intended to limit the scope of the present invention.

The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

100: Fault diagnosis system
110: Power supply
120: Solenoid valve
130: bias power supply
140: High side overcurrent judgment section
150: Low side overcurrent judgment section

Claims (16)

Power supply;
A plurality of solenoid valves operable to receive power from the power supply unit, the solenoid valves common to the high side and the low side individually;
A bias power supply for supplying a bias voltage to the solenoid valve even when the power supply unit does not supply power;
A high side overcurrent judging unit for judging whether the overcurrent flows by measuring the high side current of the solenoid valve;
A high side voltage measuring unit for measuring a high side voltage of the solenoid valve;
A plurality of low side voltage measurement units for measuring a low side voltage of each of the solenoid valves; And
A low side overcurrent judging unit for judging whether an overcurrent flows by measuring a current of a low side of each of the solenoid valves;
Wherein the solenoid valve is connected to the solenoid valve. The method according to claim 1,
Wherein the power supply unit includes a battery voltage supply unit and a boost voltage supply unit. The method according to claim 1,
Wherein the bias power supply unit includes two resistance elements having the same value. The method according to claim 1,
Wherein the high side overcurrent determining section has a first voltage comparison determining section for determining the overcurrent when the voltage value across the first shunt resistor and the first shunt resistor is greater than the first threshold voltage,
Wherein the low-side overcurrent determining section has a second voltage comparison determining section that determines the overcurrent when the voltage value across the second shunt resistor and the second shunt resistor is greater than the second threshold voltage. 5. The method of claim 4,
Wherein the first threshold voltage is greater than the second threshold voltage so that the low side overcurrent determining unit operates earlier than the high side overcurrent determining unit. 6. The method according to any one of claims 1 to 5,
Wherein the solenoid valve is applied to a direct injection injector (GDI) for a vehicle. A bias voltage supplying step of supplying a bias voltage to each of the plurality of solenoid valves individually connected to the high side in the idle state and the low side in common;
A malfunction determining step of monitoring the high side of the solenoid valve in the idle state to determine whether or not the malfunction is a fault based on the bias voltage; And
Wherein when a failure is determined in the failure determination step, a first solenoid valve and a second solenoid valve are sequentially operated among the plurality of solenoid valves, and it is determined whether or not an overcurrent exists and a simultaneous short- A failure determination step;
And the solenoid valve is connected to the solenoid valve. 8. The method of claim 7,
Wherein the failure determination step determines that a failure occurs when the voltage of the high side is lower than the first reference voltage. 9. The method of claim 8,
Wherein the first reference voltage is a value obtained by subtracting the set voltage from the bias voltage. 8. The method of claim 7,
Wherein the failure determination step determines that a failure occurs when the voltage of the high side is higher than the second reference voltage. 11. The method of claim 10,
Wherein the second reference voltage is a value obtained by adding the set voltage to the bias voltage. 8. The method of claim 7,
A first overcurrent determining step of operating the first solenoid valve and determining whether the first solenoid valve in operation is overcurrent when it is determined in the failure determination step that the simultaneous short failure is determined; And
A second overcurrent determining step of determining whether the overcurrent of the second solenoid valve is in operation when the overcurrent is determined in the first overcurrent determination step; stopping the operation of the first solenoid valve in operation and operating the second solenoid valve; An overcurrent determination step;
Wherein the solenoid valve malfunction diagnosis method comprises: 13. The method of claim 12,
Wherein the first overcurrent determining step monitors the low side of the first solenoid valve to determine whether the overcurrent flows,
Wherein the second overcurrent determining step determines whether the overcurrent flows by monitoring the high side of the second solenoid valve. 14. The method of claim 13,
Wherein the second overcurrent determining step determines whether the overcurrent is present by monitoring the high side of the first solenoid valve in operation when the overcurrent is not determined in the first overcurrent determination step, Wherein the second solenoid valve is operated and the low side of the second solenoid valve in operation is monitored to determine whether or not an overcurrent flows through the solenoid valve. A bias voltage supplying step of supplying a bias voltage to each of the plurality of solenoid valves individually connected to the high side in the idle state and the low side in common;
A malfunction determining step of monitoring the high side of the solenoid valve in the idle state to determine whether or not the malfunction is a fault based on the bias voltage;
A first overcurrent determining step of operating the first solenoid valve among the plurality of solenoid valves and monitoring the low side of the first solenoid valve in operation when it is determined as a failure in the failure determination step; And
Wherein when the overcurrent is determined in the first overcurrent determining step, the operation of the first solenoid valve in operation is stopped, the second solenoid valve different from the first solenoid valve is operated among the plurality of solenoid valves, The high side of the second solenoid valve is monitored to determine whether or not an overcurrent exists,
Wherein the first solenoid valve is operable to stop the first solenoid valve if it is determined that the first overcurrent is not overcurrent, A second overcurrent determining step of operating the second solenoid valve and monitoring the low side of the second solenoid valve in operation to determine whether the overcurrent flows;
And the solenoid valve is connected to the solenoid valve. 16. The method according to any one of claims 7 to 15,
Wherein the solenoid valve is applied to a direct injection injector (GDI) for a vehicle.


KR1020150176185A 2015-12-10 2015-12-10 Fault Diagnosis Method for Solenoid Valve And Device thereof KR101836151B1 (en)

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KR20220040319A (en) * 2020-09-23 2022-03-30 국방과학연구소 Apparatus for diagnosing defect of solenoid valve and method for the same
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KR101967557B1 (en) * 2017-12-04 2019-04-09 현대오트론 주식회사 Apparatus for detecting short-circuit of dual injector and controlling operation of dual injector
KR20190073938A (en) * 2017-12-19 2019-06-27 현대자동차주식회사 Oil pressure switch, apparatus for diagnozing piston cooling oil jet, and method using the same
US11467062B2 (en) 2017-12-19 2022-10-11 Hyundai Motor Company Oil pressure switch, apparatus for diagnosing piston cooling oil jet, and method of controlling the same
KR20220040319A (en) * 2020-09-23 2022-03-30 국방과학연구소 Apparatus for diagnosing defect of solenoid valve and method for the same
KR102629430B1 (en) * 2022-09-01 2024-01-25 주식회사 현대케피코 Method and apparatus for inductive coupling noise diagnosis

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