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KR101826698B1 - Fault Diagnosis Method for Solenoid Valve Of High Pressure Pump And Device Thereof - Google Patents

Fault Diagnosis Method for Solenoid Valve Of High Pressure Pump And Device Thereof Download PDF

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Publication number
KR101826698B1
KR101826698B1 KR1020150178675A KR20150178675A KR101826698B1 KR 101826698 B1 KR101826698 B1 KR 101826698B1 KR 1020150178675 A KR1020150178675 A KR 1020150178675A KR 20150178675 A KR20150178675 A KR 20150178675A KR 101826698 B1 KR101826698 B1 KR 101826698B1
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KR
South Korea
Prior art keywords
voltage
solenoid valve
bias
low side
overcurrent
Prior art date
Application number
KR1020150178675A
Other languages
Korean (ko)
Other versions
KR20170070755A (en
Inventor
이시광
Original Assignee
현대오트론 주식회사
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Priority to KR1020150178675A priority Critical patent/KR101826698B1/en
Publication of KR20170070755A publication Critical patent/KR20170070755A/en
Application granted granted Critical
Publication of KR101826698B1 publication Critical patent/KR101826698B1/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
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F02M59/46—Valves
    • F02M59/466—Electrically operated valves, e.g. using electromagnetic or piezoelectric operating means
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • F02D2041/224—Diagnosis of the fuel system
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Magnetically Actuated Valves (AREA)

Abstract

The present invention relates to a method for diagnosing a solenoid valve failure in a high-pressure pump, and more particularly, to a solenoid valve for determining a short-circuit or battery short-circuit failure, an open- And a method for diagnosing a valve failure.

Description

TECHNICAL FIELD [0001] The present invention relates to a solenoid valve for diagnosing a malfunction of a solenoid valve,

The present invention relates to a method for diagnosing a solenoid valve failure in a high-pressure pump, and more particularly to a method and apparatus for solenoid valve failure diagnosis in a high-pressure pump, The present invention relates to a solenoid valve malfunction diagnosis method 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, a fuel supply device of a vehicle may be configured to include a fuel tank, a fuel rail, and a fuel pump. The fuel rail stores the high-pressure fuel and distributes the stored high-pressure fuel to each injector. The fuel rail is provided with a plurality of injectors, and each injector is connected to a cylinder head or an intake manifold to inject fuel into the combustion chamber or the port. The fuel rail is connected to the fuel tank and receives fuel from the fuel tank. A high-pressure pump is installed between the fuel rail and the fuel tank, and the high-pressure pump compresses the fuel from the fuel tank to a high pressure and transfers the fuel to the fuel rail.

On the other hand, a flow control valve may be provided inside the high-pressure pump. As an example of such a flow control valve, there is a solenoid valve.

An example of the operation of a solenoid valve installed inside a conventional high-pressure pump is control of its operation in such a manner that a battery voltage is supplied at a high side and a control signal is transmitted at a 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 high-pressure pump is driven. Therefore, when such a failure occurs, .

Especially, it is urgent to develop a sensing technique for battery short fault, ground short fault, open load fault and high side / low side short fault when the high pressure pump is driven.

Accordingly, it is an object of the present invention to provide a solenoid valve that is capable of preventing a short-circuit failure of a solenoid valve, a short-circuit fault, an open- And to provide a detection technique for a short fault.

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 solenoid valve operated by receiving power from the power supply unit; 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 voltage measuring unit for measuring a high side voltage of the solenoid valve; A low side voltage measuring unit for measuring a low side voltage of the solenoid valve; And an overcurrent judging unit for judging whether or not an overcurrent flows by measuring a current of a low side of the solenoid valve,
Side voltage measuring unit and the bias voltage information supplied from the bias power supply unit in the idle state to compare the voltage information measured by the high-side voltage measuring unit and the low-side voltage measuring unit with the bias voltage information supplied from the bias power supply unit, Side fault of the solenoid valve when the voltage of the high side is higher than the second reference voltage and diagnoses the battery short fault when the voltages of the high side and the low side are both higher than the second reference voltage, When an overcurrent flows in the overcurrent judging section in the driving state of the solenoid, the short circuit of the solenoid is judged as an open-circuit fault when the voltage of the low- A solenoid characterized by being able to diagnose by circuit fault It can provide a diagnosis system of de-valve.

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According to an embodiment of the present invention, the power supply unit may include a battery installed in the vehicle. According to an embodiment of the present invention, the bias power supply unit may include two resistance elements having the same value.

According to an embodiment of the present invention, the overcurrent judging unit may have a shunt resistor provided on the low side and a voltage comparison judging unit judging to be an overcurrent when the voltage value applied to the shunt resistor is larger than the threshold voltage.

The overcurrent determining unit may include a timer for measuring an elapsed time from the operation of the solenoid valve to measure an overcurrent flowing through the solenoid valve. The overcurrent determining unit may determine the overcurrent when the measured current value reaches the threshold current value before the elapsed time measured by the timer reaches the preset time.

According to the embodiment, the above-described solenoid valve may be applied to control the flow path of the high-pressure pump for a vehicle.

According to another aspect of the present invention, there is provided a plasma display apparatus comprising: a bias voltage supply step of supplying a bias voltage to a solenoid valve in an idle state;

A ground short fault determination step of monitoring a high side and a low side of the solenoid valve in the idle state to determine whether a short circuit to ground is present based on the bias voltage;

An open load failure determination step of monitoring the high side and the low side of the solenoid valve in the idle state to determine whether the open load failure is based on the bias voltage; And

And a short circuit fault determining step of operating the solenoid valve and determining whether the short circuit between the high side and the low side is faulty.

According to an embodiment of the present invention, the ground short fault determination step may include determining that the ground short fault occurs when the voltages of the high side and the low side are both lower than the first reference voltage. Here, the first reference voltage may be a value obtained by subtracting the set voltage from the bias voltage.

According to the embodiment, the open-load failure determination step may include determining that the open-load failure occurs when the high-side voltage is between the second reference voltage and the first reference voltage and the voltage on the low-side is lower than the first reference voltage . Here, the first reference voltage may be a value obtained by subtracting the set voltage from the bias voltage, and the second reference voltage may be a value obtained by adding the set voltage to the bias voltage.

According to an embodiment of the present invention, the short-circuit fault determination step may include determining the short-circuit fault when the overcurrent flows by measuring the current of the low-side. The short circuit failure determination step may be characterized by determining that the overcurrent occurs when the current value reaches the threshold current value before the elapsed time elapsed from the operation of the solenoid valve reaches the set time.

According to another aspect of the present invention, there is provided a plasma display apparatus comprising: a bias voltage supply step of supplying a bias voltage to a solenoid valve in an idle state;

A battery short fault determination step of monitoring a high side and a low side of the solenoid valve in the idle state and determining whether a battery is short circuit to battery based on the bias voltage;

An open load failure determination step of monitoring the high side and the low side of the solenoid valve in the idle state to determine whether the open load failure is based on the bias voltage; And

And a short circuit fault determining step of operating the solenoid valve and determining whether the short circuit between the high side and the low side is faulty.

According to an embodiment of the present invention, the battery short fault determination step may be characterized by determining that the battery short fault occurs when the voltages of the high side and the low side are both higher than the second reference voltage. Here, the second reference voltage may be a value obtained by adding the set voltage at the bias voltage.

According to the embodiment, the open-load failure determination step may include determining that the open-load failure occurs when the high-side voltage is between the second reference voltage and the first reference voltage and the voltage on the low-side is lower than the first reference voltage . Here, the first reference voltage may be a value obtained by subtracting the set voltage from the bias voltage, and the second reference voltage may be a value obtained by adding the set voltage to the bias voltage.

According to an embodiment of the present invention, the short-circuit fault determination step may include determining the short-circuit fault when the overcurrent flows by measuring the current of the low-side. The short circuit failure determination step may be characterized by determining that the overcurrent occurs when the current value reaches the threshold current value before the elapsed time elapsed from the operation of the solenoid valve reaches the set time.

In the solenoid valve failure diagnosis method described above, the solenoid valve may be applied to control the flow path of the high-pressure pump for a vehicle.

As described above, according to an embodiment of the present invention, it is possible to detect and respond to battery short fault, ground short fault, open load fault, and high side / low side short fault of the solenoid valve when the high pressure pump is driven.

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 an embodiment of a method for diagnosing a failure of a solenoid valve according to the present invention.
3 is a flowchart showing a method of diagnosing a failure of the solenoid valve of FIG.
4 is a block diagram showing another embodiment of a method for diagnosing a failure of a solenoid valve according to the present invention.
5 is a flowchart showing a method for diagnosing a failure of the solenoid valve of FIG.

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. Fig. 1 (a) shows an embodiment of a fault diagnosis system for a solenoid valve, and Fig. 1 (b) shows a circuit diagram for setting a threshold voltage.

The fault diagnosis system 100 of the solenoid valve 120 according to the present embodiment includes a power supply unit 110; A solenoid valve 120 operated by receiving power from the power supply unit 110; 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 voltage measurement unit for measuring a high side voltage (HFV) of the solenoid valve 120; A low side voltage measuring unit for measuring a low side voltage (LFV) of the solenoid valve 120; And

And an overcurrent judging unit (140) for measuring the current of the low side of the solenoid valve and judging whether an overcurrent exists or not.

Here, the solenoid valve 120 may be adapted to control a flow path of a high-pressure pump for a vehicle.

The power supply unit 110 may include a battery power source installed in the vehicle and a first switch 111 connected between the battery power source and the high side of the solenoid valve 120. The solenoid valve 120, The solenoid valve 120 can receive power from the battery and can drive the solenoid valve 120 when the first switch 111 of the high side of the solenoid valve 120 is turned on. The bias power supply 130 may include a structure in which two resistance elements R1 and R2 having the same value are connected in series and a battery voltage VBAT may be connected to the resistance element R1, 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. The second switch 112 may be connected to the low side of the solenoid valve 120 according to the embodiment.

 The overcurrent determining unit 140 may determine the elapsed time from the operation of the solenoid valve 120 to measure the overcurrent flowing through the solenoid valve 120 and the shunt resistor R3 installed on the low side, And a voltage comparison judging section 142 for judging the overcurrent when the voltage value applied to the shunt resistor R3 is greater than the threshold voltage V1.

Here, the voltage comparison determination section 142 may be configured to include two OP-amplifier elements and two resistance elements R4 and R5. On the other hand, the threshold voltage V1 may be determined by two resistive elements R4 and R5 connected in series, and may be arbitrarily set by the user by adjusting the resistance elements R4 and R5.

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

The overcurrent determining unit 140 according to the above configuration determines that the elapsed time measured by the timer 141 has a current value measured based on the shunt resistor R3 before the set time reaches When the threshold current value is reached, it can be judged as an overcurrent. Here, whether the current value measured based on the shunt resistor R3 reaches the threshold current value can be determined whether or not the voltage value measured at the shunt resistor R3 exceeds the threshold voltage V1 value.

During operation of the solenoid valve, the overcurrent can flow at any time for any reason. Therefore, in this embodiment, the timer 141 is used to determine whether the overcurrent is caused by a fault.

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.

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

The method for diagnosing a solenoid valve 120 according to the first embodiment of the present invention includes a bias voltage supply step S100 for supplying a bias voltage Bias to an solenoid valve 120 in an idle state;

A ground short fault determination step (S110) of monitoring a high side and a low side of the solenoid valve (120) in the idle state to determine whether a short circuit to ground is present based on the bias voltage (Bias);

An open load failure determination step (S120) of monitoring the high side and the low side of the solenoid valve (120) in the idle state to determine whether the open load fails based on the bias voltage (Bias); And

And a short circuit fault determination step (S130) of operating the solenoid valve (120) and determining whether the short circuit between the high side and the low side is faulty.

According to the embodiment, the ground short fault determination step (S110) can determine that the ground short fault occurs when both the high side voltage and the low side voltage (LFV) are lower than the first reference voltage.

According to an embodiment of the present invention, the open-load fault determining step S120 may be configured such that the high-side voltage HFV is between the second reference voltage and the first reference voltage, and the low- If it is low, it can be judged as an open load failure. Here, the first reference voltage may be a value obtained by subtracting the set voltage from the bias voltage Bias, and the second reference voltage may be a value obtained by adding the set voltage to the bias voltage Bias.

In addition, according to the embodiment, the short circuit fault determination step (S130) can determine the short circuit fault when the overcurrent flows by measuring the current in the low side. The short circuit failure determination step S130 may determine the overcurrent when the current value reaches the threshold current value before the elapsed time elapsed from the operation of the solenoid valve 120 reaches the set time.

Here, the bias voltage Bias is constituted by two resistance elements R1 and R2. When the two resistance elements R1 and R2 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.

3 is a flowchart showing a method of diagnosing a failure of the solenoid valve of FIG.

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), the high side voltage (HFV) and the low side voltage (LFV) of the solenoid valve 120 are monitored.

If it is detected that both the high side voltage HFV of the solenoid valve 120 and the low side voltage LFV are lower than the first reference voltage Bias-1V, the high side of the solenoid valve 120 It is possible to determine that a short to GND fault has occurred in the low side or the low side and record the corresponding fault and stop the operation of the solenoid valve 120. [

On the other hand, when it is not detected that both the high side voltage HFV and the low side voltage LFV of the solenoid valve 120 are lower than the first reference voltage Bias-1V, The high side voltage HFV and the low side voltage LFV of the solenoid valve 120 are continuously monitored in the idle state so that the high side voltage HFV is smaller than the second reference voltage Bias + (Open load disconnection) if it is detected that the voltage of the low side is larger than the first reference voltage (Bias-1V) and the voltage LFV of the low side is smaller than the first reference voltage (Bias-1V) The failure can be recorded and the operation of the solenoid valve 120 can be stopped.

However, as a result of the monitoring, if the voltage HFV of the high side is smaller than the second reference voltage Bias + 1V and is larger than the first reference voltage Bias-1V, and the voltage LFV of the low side is higher than the first reference voltage (Bias-1V) is not detected, the solenoid valve 120 is operated (S130). When the solenoid valve 120 is operated, the high and low side switches 111 and 112 of the solenoid valve 120 are simultaneously turned on, and the timer 141 starts to operate.

For example, if the user sets the set time of the timer 141 to 6us, the timer 141 is activated simultaneously with the operation of the solenoid valve 120, and the shunt resistor R3 When the measured current value reaches the threshold current value set by the user, it is determined to be the overslow rate, and in this case, it can be determined that a short has occurred. In FIG. 3, the case where the LFSV signal corresponding to the threshold current value is set to 1 is illustrated.

However, when the measured current value does not reach the threshold current value or the measured current value reaches the threshold current value in a state where the elapsed time (Elapsed Time) exceeds the set time of the timer 141, the solenoid valve It can be determined that the mobile terminal 120 normally operates.

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

The first embodiment and the second embodiment of the method of diagnosing a malfunction of the solenoid valve 120 according to the present invention differ from the first embodiment in that the short-circuit fault determination step S110 and the short-circuit failure determination step S210 are different. 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 solenoid valve 120 according to the second embodiment of the present invention includes a bias voltage supply step S200 for supplying a bias voltage Bias to the solenoid valve 120 in an idle state;

A battery short fault determination step (S210) for monitoring the high side and the low side of the solenoid valve (120) in the idle state and determining whether a battery is short circuit to battery based on the bias voltage (Bias);

An open load failure determination step (S220) for monitoring the high side and the low side of the solenoid valve (120) in the idle state and determining whether the open load fails based on the bias voltage (Bias); And

And a short circuit fault determination step (S230) for operating the solenoid valve (120) and determining whether the short circuit between the high side and the low side is faulty.

According to the embodiment, the battery short fault determination step (S210) may determine that the battery short fault occurs when both the high side voltage and the low side voltage (LFV) are higher than the second reference voltage. Here, the second reference voltage may be a value obtained by adding the set voltage to the bias voltage Bias.

5 is a flowchart showing a method for diagnosing a failure of the solenoid valve of FIG.

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 S200) and monitors the high side voltage (HFV) and the low side voltage (LFV) of the solenoid valve (120).

As a result of the monitoring, when it is detected that the high side voltage HFV of the solenoid valve 120 and the low side voltage LFV are both higher than the second reference voltage Bias + 1V, the high side of the solenoid valve 120 It is possible to determine that a short-circuit to battery has occurred on the low side or the short-circuit to battery on the low side, record the failure and stop the operation of the solenoid valve 120.

On the other hand, if neither the high side voltage HFV of the solenoid valve 120 nor the low side voltage LFV is higher than the second reference voltage Bias + 1V, the idle state of the solenoid valve 120 Side voltage HFV and the low-side voltage LFV of the solenoid valve 120 are monitored so that the voltage HFV of the high side is smaller than the second reference voltage Bias + It is determined whether or not the voltage of the low side is greater than the voltage Bias-1V and the voltage LFV of the low side is smaller than the first reference voltage Bias-1V. If such a case is detected, the open load disconnection is determined If it is determined that an open load failure has occurred, the corresponding failure can be recorded and the operation of the solenoid valve 120 can be stopped.

However, as a result of the monitoring, if the voltage HFV of the high side is smaller than the second reference voltage Bias + 1V and is larger than the first reference voltage Bias-1V, and the voltage LFV of the low side is higher than the first reference voltage (Bias-1V) is not detected, the solenoid valve 120 is operated (S130). When the solenoid valve 120 is operated, the high and low side switches 111 and 112 of the solenoid valve 120 are simultaneously turned on, and the timer 141 starts to operate. The following process is substantially the same as the first embodiment.

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: Overcurrent judging unit

Claims (18)

Power supply;
A solenoid valve operated by receiving power from the power supply unit;
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 voltage measuring unit for measuring a high side voltage of the solenoid valve;
A low side voltage measuring unit for measuring a low side voltage of the solenoid valve; And
And an overcurrent judging section for judging whether an overcurrent flows by measuring a current on the low side of the solenoid valve,
And a controller for comparing the voltage information measured by the high-side voltage measuring unit and the low-side voltage measuring unit in the idle state with the bias voltage information supplied from the bias power supply unit,
A short-circuit failure of the solenoid valve is diagnosed when both the high-side and low-side voltages are lower than the first reference voltage,
If the voltage of the high side and the voltage of the low side are both higher than the second reference voltage, diagnose a battery short fault,
The open-load fault is diagnosed when the voltage of the high-side is between the second reference voltage and the first reference voltage, and the voltage of the low-side is lower than the first reference voltage,
Wherein a diagnosis of a solenoid valve malfunction can be made by judging that an overcurrent flows in the overcurrent judging section in the driving state of the solenoid. The method according to claim 1,
Wherein the power supply unit includes a battery installed in the vehicle. 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 overcurrent determining unit includes a timer for measuring an elapsed time from the operation of the solenoid valve to measure an overcurrent flowing in the solenoid valve. 5. The method of claim 4,
Wherein the overcurrent determining unit determines the overcurrent when the measured current value reaches the threshold current value before the elapsed time measured by the timer reaches the set time. The method according to claim 1,
Wherein the overcurrent judging section has a shunt resistor provided on the low side and a voltage comparison judging section for judging the overcurrent when the voltage value applied to the shunt resistor is larger than the threshold voltage. 7. The method according to any one of claims 1 to 6,
Wherein the solenoid valve is adapted to control a flow path of a high-pressure pump for a vehicle. A bias voltage supply step of supplying a bias voltage to the solenoid valve in an idle state;
A ground short fault determination step of monitoring a high side and a low side of the solenoid valve in the idle state to determine whether a short circuit to ground is present based on the bias voltage;
An open load failure determination step of monitoring the high side and the low side of the solenoid valve in the idle state to determine whether the open load failure is based on the bias voltage; And
A short circuit fault determination step of operating the solenoid valve and determining whether a short circuit fault occurs between the high side and the low side;
And the solenoid valve is connected to the solenoid valve. 9. The method of claim 8,
Wherein the ground short fault determination step determines that the ground short fault occurs when both the high side voltage and the low side voltage are lower than the first reference voltage. 10. The method of claim 9,
Wherein the first reference voltage is a value obtained by subtracting the set voltage from the bias voltage. A bias voltage supply step of supplying a bias voltage to the solenoid valve in an idle state;
A battery short fault determination step of monitoring a high side and a low side of the solenoid valve in the idle state and determining whether a battery is short circuit to battery based on the bias voltage;
An open load failure determination step of monitoring the high side and the low side of the solenoid valve in the idle state to determine whether the open load failure is based on the bias voltage; And
A short circuit fault determination step of operating the solenoid valve and determining whether a short circuit fault occurs between the high side and the low side;
And the solenoid valve is connected to the solenoid valve. 12. The method of claim 11,
Wherein the battery short fault determination step determines that the battery short fault occurs when both the high side voltage and the low side voltage are higher than the second reference voltage. 13. The method of claim 12,
Wherein the second reference voltage is a value obtained by adding the set voltage to the bias voltage. The method according to claim 8 or 11,
Wherein the open load failure determination step determines that the open-load failure occurs when the voltage of the high side is between the second reference voltage and the first reference voltage, and the voltage of the low side is lower than the first reference voltage. Valve fault diagnosis method. 15. The method of claim 14,
Wherein the first reference voltage is a value obtained by subtracting the set voltage from the bias voltage, and the second reference voltage is a value obtained by adding the set voltage to the bias voltage. The method according to claim 8 or 11,
Wherein the short circuit failure determination step measures the current of the low side and determines that a short circuit failure occurs when an overcurrent flows. 17. The method of claim 16,
Wherein the short circuit failure determination step determines that the overcurrent occurs when the current value reaches the threshold current value before the elapsed time elapsed from the operation of the solenoid valve reaches the set time. 14. The method according to any one of claims 8 to 13,
Wherein the solenoid valve is adapted to control a flow path of a high-pressure pump for a vehicle.

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