KR20130114538A - Diagnosis device of troubling fuel pressure control valve for electronic control diesel engine - Google Patents

Diagnosis device of troubling fuel pressure control valve for electronic control diesel engine Download PDF

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Publication number
KR20130114538A
KR20130114538A KR1020120036983A KR20120036983A KR20130114538A KR 20130114538 A KR20130114538 A KR 20130114538A KR 1020120036983 A KR1020120036983 A KR 1020120036983A KR 20120036983 A KR20120036983 A KR 20120036983A KR 20130114538 A KR20130114538 A KR 20130114538A
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KR
South Korea
Prior art keywords
fuel
control valve
flow rate
pressure control
fuel pressure
Prior art date
Application number
KR1020120036983A
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Korean (ko)
Inventor
조홍현
김태중
Original Assignee
조선대학교산학협력단
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Application filed by 조선대학교산학협력단 filed Critical 조선대학교산학협력단
Priority to KR1020120036983A priority Critical patent/KR20130114538A/en
Publication of KR20130114538A publication Critical patent/KR20130114538A/en

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    • 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
    • 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
    • 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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/04—Feeding by means of driven pumps
    • F02M37/08—Feeding by means of driven pumps electrically driven
    • F02M2037/085—Electric circuits therefor
    • 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)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Abstract

PURPOSE: A fuel pressure control valve trouble diagnosis apparatus of an electronically controlled diesel engine is provided to determine whether a fuel pressure control valve is broken or not by comprising a fuel flow meter on a fuel return line and comparing a predetermined reference flow rate value with a measured flow rate value which is measured on the fuel flow meter. CONSTITUTION: A fuel pressure control valve trouble diagnosis apparatus of an electronically controlled diesel engine includes a fuel flow meter (10) and a computing unit (20). The fuel flow meter measures the flow rate of fuel which returns through the fuel return line by being installed on a fuel return line which is connected to a fuel pressure control valve (1) of an electronically controlled diesel engine. The computing unit determines whether the fuel pressure control valve is broken or not by comparing a predetermined reference flow rate value with a measured flow rate value which is measured by the fuel flow meter. [Reference numerals] (1) Fuel pressure control valve; (10) Fuel flow meter; (20) Computing unit; (30) Alarming unit; (a) Fuel tank; (AA) Pressure sensor; (b) Low pressure pump; (BB) Summer switch; (c) Fuel filter; (CC) Over flow valve; (d) High pressure pump; (DD) Sensor line; (e) Common rail; (EE) Fuel return line; (f) Injector; (FF) Fuel low pressure line; (GG) Fuel high pressure line

Description

DIAGNOSIS DEVICE OF TROUBLING FUEL PRESSURE CONTROL VALVE FOR ELECTRONIC CONTROL DIESEL ENGINE}

The present invention relates to an apparatus for diagnosing a failure of a fuel pressure control valve of an electronically controlled diesel engine. More specifically, in view of the fact that the fuel pressure control valve is defective, the flow rate of the fuel returned through the fuel return line is increased. A fuel flow meter is provided in the fuel return line to diagnose a failure of a control valve in real time, and a failure of the fuel pressure control valve is determined by comparing the set flow rate value and the measured flow rate value measured by the fuel flow meter. The present invention relates to a fuel pressure control valve failure diagnosis device of an electronically controlled diesel engine that can protect a vehicle system by preventing a performance degradation of a vehicle caused by the failure of a failed fuel pressure control valve and inducing rapid maintenance.

As is well known, an automobile engine is a device that generates power by supplying air and fuel in a cylinder and burning it.

In the case of an electronically controlled diesel engine, in order to inject fuel into a cylinder through an injector at a pressure set in an ECU (Electronic Control Unit), the fuel pressure accumulated in the common rail must be kept constant. Receives a signal from the ECU to control the fuel pressure in the common rail to maintain a constant.

When the performance of the fuel pressure regulating valve is degraded, there are phenomena such as starting failure, starting delay, poor acceleration (lack of output), engine failure, and the like. Required.

Conventionally, in order to diagnose the failure of the fuel pressure regulating valve, a gas tight test of the fuel pressure regulating valve is performed by forming a vacuum with a vacuum gauge and diagnosing a failure when the vacuum is released within a predetermined time. The method of checking the fuel pressure control valve sensor output value is adopted, which causes a large amount of loss in time and cost.

That is, in the past, it is difficult for the driver to judge the failure of the fuel pressure regulating valve by himself, and only when the vehicle has an abnormal symptom, the maintenance plant is visited. If it is possible to determine whether the fuel pressure regulating valve has failed, it is possible to determine the failure of the fuel pressure regulating valve by attaching a separate device to the fuel pressure regulating valve and conducting an experiment. If it was determined that there was a problem that wasted unnecessary time and cost, even if it is determined through the experiment that the fuel pressure control valve failure, it is not a way to confirm in advance whether the fuel pressure control valve failure There was a problem.

The present invention has been made to solve the problems of the prior art as described above, the object of the present invention is to focus on the fuel pressure in that the flow rate of the fuel returned through the fuel return line is increased when the fuel pressure control valve is defective A fuel flow meter is provided in the fuel return line to diagnose a failure of a control valve in real time, and a failure of the fuel pressure control valve is determined by comparing the set flow rate value and the measured flow rate value measured by the fuel flow meter. It is to provide a fuel diaphragm failure diagnosis device of an electronically controlled diesel engine that can protect the vehicle system by preventing the performance degradation of the vehicle caused by the failure of the failed fuel pressure regulating valve and inducing rapid maintenance. Is in.

In order to achieve the above object, a fuel pressure control valve failure diagnosis apparatus for an electronically controlled diesel engine according to the present invention is installed in a fuel return line connected to a fuel pressure control valve of an electronically controlled diesel engine and returned through the fuel return line. A fuel flow meter for measuring the flow rate of the fuel; A calculating unit which compares the set reference flow rate value with the measured flow rate value measured by the fuel flow meter to determine whether the fuel pressure regulating valve is in trouble; .

In addition, in the fuel pressure control valve failure diagnosis apparatus of the electronically controlled diesel engine according to the present invention, the calculation unit is set to the flow rate of the fuel returned through the fuel return line in the normal state, the reference flow rate, the reference The allowable flow rate value is set to be larger than the reference flow rate value based on the flow rate value. When the measured flow rate value measured by the fuel flow meter exceeds the allowable flow rate value, the fuel pressure regulating valve is determined to be a failure. .

In addition, the fuel pressure control valve failure diagnosis apparatus for an electronically controlled diesel engine according to the present invention, the alarm unit that can be visually or audibly informed to the user when it is determined that the fuel pressure control valve failure in the operation unit; And further comprising:

By the above configuration, the fuel pressure control valve failure diagnosis device of the electronically controlled diesel engine according to the present invention can diagnose the fuel pressure control valve in real time and determine whether there is a failure. It is possible to prevent and maintain phenomena such as lack of output) and engine damage to protect the vehicle system, to prevent the failure of fuel pressure control valves and other parts, to minimize fuel waste, and to make self-determination. This makes it possible to save time and money for maintenance.

1 is a block diagram of a fuel pressure control valve failure diagnosis apparatus for an electronically controlled diesel engine according to an embodiment of the present invention.
Figure 2 is a graph showing the flow rate of the fuel returned through the fuel return line in the fuel pressure control valve failure diagnosis apparatus of the electronically controlled diesel engine according to an embodiment of the present invention

Hereinafter, an apparatus for diagnosing a failure of a fuel pressure control valve of an electronically controlled diesel engine according to an embodiment of the present invention will be described in detail with reference to the embodiment illustrated in the drawings.

1 is a block diagram of a fuel pressure control valve failure diagnosis apparatus for an electronically controlled diesel engine according to an embodiment of the present invention, Figure 2 is a fuel pressure control valve failure diagnosis of an electronically controlled diesel engine according to an embodiment of the present invention. A graph showing the flow rate of fuel returned through the fuel return line from the device.

Referring to the drawings, an apparatus for diagnosing a failure of a fuel pressure control valve of an electronically controlled diesel engine according to an exemplary embodiment of the present invention includes a fuel flow meter 10, a calculation unit 20, and an alarm unit 30.

As shown in FIG. 1, fuel in an electronically controlled diesel engine is sequentially passed through a fuel low pressure line (green) from a fuel tank through a low pressure pump, a fuel filter, and a high pressure pump. Through ⓔ common rails are stored under pressure.

In the case of the electronically controlled diesel engine, in order to inject fuel into the cylinder through the injector at a pressure set in the ECU (Electronic Control Unit), the fuel pressure accumulated in the ⓔ common rail must be kept constant. In response to the signal, a fuel pressure control valve 1 (also referred to as a “pressure regulator”) is mounted on the ⓔ common rail so that the fuel pressure in the ⓔ common rail is kept constant.

On the other hand, the fuel returned after the fuel pressure in the ⓔ common rail is adjusted through the fuel pressure control valve 1 has a structure that is recovered to the fuel tank ⓐ through the fuel return line (blue).

On the other hand, when the fuel pressure control valve 1 is broken, the fuel pressure control in the ⓔ common rail is not smooth, and thus the flow rate of the fuel returned to the fuel return line (blue) increases.

The fuel flow meter 10 adjusts the fuel pressure of the electronically controlled diesel engine to use the relationship between the abnormality of the fuel pressure control valve as described above and the flow rate of the fuel returned to the fuel return line (blue) in the diagnostic apparatus according to the present invention. The valve 1 is installed in the fuel return line (blue) to measure the flow rate of the fuel returned through the fuel return line (blue). Meanwhile, the measured flow rate value measured by the fuel flow meter 10 is transmitted to the calculation unit 20 through a sensor line (cyan).

The calculating unit 20 compares the set reference flow rate value and the measured flow rate value measured by the fuel flow meter 10 to determine whether the fuel pressure regulating valve 1 is broken or not. It is preferable that the electronic control unit is configured to serve as the operation unit 20.

On the other hand, the calculation unit 20 is set to the flow rate of the fuel returned through the fuel return line (blue) in the normal state as shown in Figure 2, the reference flow value based on the reference flow rate The allowable flow rate value is set larger than the flow rate value, and is configured to determine that the fuel pressure regulating valve 1 is broken when the measured flow rate value measured by the fuel flow meter 10 exceeds the allowable flow rate value.

That is, as described above, when the fuel pressure regulating valve 1 is broken, the fuel pressure control in the ⓔ common rail is not smooth, so that the flow rate of the fuel returned to the fuel return line (blue) is increased. When the measured flow rate value measured by the fuel flow meter 10 exceeds the set allowable flow rate value, the fuel pressure control valve 1 is diagnosed as a failure.

The alarm unit 30 is a dashboard of the vehicle so that the driver of the vehicle can be easily recognized in a configuration that informs the user visually or acoustically when it is determined that the fuel pressure control valve 1 in the operation unit 20 is broken It is preferable to configure so that the abnormality of the fuel pressure regulating valve 1 can be notified by turning on the engine check warning light.

The fuel pressure control valve failure diagnosis apparatus of the electronically controlled diesel engine according to the present invention is capable of diagnosing the fuel pressure control valve 1 in real time and determining whether there is a failure by the organic coupling relationship of the above components. It is possible to protect the vehicle system by preventing performance degradation of the vehicle caused by the failure of the failed fuel pressure regulating valve 1 and inducing quick maintenance.

The fuel pressure control valve fault diagnosis apparatus of the electronically controlled diesel engine described above and illustrated in the drawings is only one embodiment for implementing the present invention, and should not be construed as limiting the technical idea of the present invention. The scope of protection of the present invention is defined only by the matters set forth in the claims below, and the embodiments which have been improved and changed without departing from the gist of the present invention will be apparent to those skilled in the art. It will be said to belong to the protection scope of the present invention.

10 fuel flow meter
20 calculator
30 alarms

Claims (3)

A fuel flow meter installed in a fuel return line connected to a fuel pressure control valve of an electronically controlled diesel engine to measure a flow rate of the fuel returned through the fuel return line;
A calculating unit which compares the set reference flow rate value with the measured flow rate value measured by the fuel flow meter to determine whether the fuel pressure regulating valve is in trouble; Fuel pressure control valve failure diagnosis device for an electronically controlled diesel engine comprising a. The method of claim 1,
The calculation unit, the reference flow rate is set to the flow rate of the fuel returned through the fuel return line in the normal state, the allowable flow rate value is set larger than the reference flow rate value based on the reference flow rate value, the fuel The fuel pressure control valve failure diagnosis device for an electronically controlled diesel engine, characterized in that it is determined that the fuel pressure control valve has failed when the measured flow rate value measured by the flow meter exceeds the allowable flow value. 3. The method according to claim 1 or 2,
An alarm unit for notifying the user visually or audibly when the fuel pressure control valve is determined to be faulty by the operation unit; Fuel pressure control valve failure diagnosis device for an electronically controlled diesel engine, characterized in that it further comprises.
KR1020120036983A 2012-04-09 2012-04-09 Diagnosis device of troubling fuel pressure control valve for electronic control diesel engine KR20130114538A (en)

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KR1020120036983A KR20130114538A (en) 2012-04-09 2012-04-09 Diagnosis device of troubling fuel pressure control valve for electronic control diesel engine

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KR1020120036983A KR20130114538A (en) 2012-04-09 2012-04-09 Diagnosis device of troubling fuel pressure control valve for electronic control diesel engine

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104214027A (en) * 2014-07-30 2014-12-17 河南科技大学 Common rail pressure stabilization multi-passage controllable fuel injection system
CN112666899A (en) * 2019-10-16 2021-04-16 新特能源股份有限公司 Control method and system of regulating valve group, electronic equipment and storage medium
CN113503216A (en) * 2021-08-25 2021-10-15 一汽解放汽车有限公司 Diesel engine fuel supply system and testing method thereof
CN114278475A (en) * 2022-01-07 2022-04-05 龙口龙泵柴油喷射高科有限公司 Pump-rail integrated electric control common rail high-pressure oil supply system assembly

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104214027A (en) * 2014-07-30 2014-12-17 河南科技大学 Common rail pressure stabilization multi-passage controllable fuel injection system
CN112666899A (en) * 2019-10-16 2021-04-16 新特能源股份有限公司 Control method and system of regulating valve group, electronic equipment and storage medium
CN113503216A (en) * 2021-08-25 2021-10-15 一汽解放汽车有限公司 Diesel engine fuel supply system and testing method thereof
CN114278475A (en) * 2022-01-07 2022-04-05 龙口龙泵柴油喷射高科有限公司 Pump-rail integrated electric control common rail high-pressure oil supply system assembly
CN114278475B (en) * 2022-01-07 2023-12-01 龙口龙泵柴油喷射高科有限公司 Pump rail integrated electric control common rail high-pressure oil supply system assembly

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