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AU2006201753B2 - Method for Detecting Disconnection of an On Signal-Transmitting Line of an LPG Switch - Google Patents
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AU2006201753B2 - Method for Detecting Disconnection of an On Signal-Transmitting Line of an LPG Switch - Google Patents

Method for Detecting Disconnection of an On Signal-Transmitting Line of an LPG Switch Download PDF

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Publication number
AU2006201753B2
AU2006201753B2 AU2006201753A AU2006201753A AU2006201753B2 AU 2006201753 B2 AU2006201753 B2 AU 2006201753B2 AU 2006201753 A AU2006201753 A AU 2006201753A AU 2006201753 A AU2006201753 A AU 2006201753A AU 2006201753 B2 AU2006201753 B2 AU 2006201753B2
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AU
Australia
Prior art keywords
lpg switch
timer
operated
signal
rpm
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
AU2006201753A
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AU2006201753A1 (en
Inventor
Woo Jik Lee
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hyundai Motor Co
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Hyundai Motor Co
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Filing date
Publication date
Application filed by Hyundai Motor Co filed Critical Hyundai Motor Co
Publication of AU2006201753A1 publication Critical patent/AU2006201753A1/en
Application granted granted Critical
Publication of AU2006201753B2 publication Critical patent/AU2006201753B2/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F02M21/0203—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels characterised by the type of gaseous fuel
    • F02M21/0209—Hydrocarbon fuels, e.g. methane or acetylene
    • F02M21/0212—Hydrocarbon fuels, e.g. methane or acetylene comprising at least 3 C-Atoms, e.g. liquefied petroleum gas [LPG], propane or butane
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q11/00—Arrangement of monitoring devices for devices provided for in groups B60Q1/00 - B60Q9/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D19/02—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with gaseous fuels
    • F02D19/025—Failure diagnosis or prevention; Safety measures; Testing
    • 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
    • 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
    • Y02T10/30—Use of alternative fuels, e.g. biofuels
    • 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)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • General Chemical & Material Sciences (AREA)
  • Biomedical Technology (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Transmitters (AREA)
  • Maintenance And Management Of Digital Transmission (AREA)
  • Interface Circuits In Exchanges (AREA)

Description

AUSTRALIA
Patents Act 1990 COMPLETE SPECIFICATION FOR A STANDARD PATENT
ORIGINAL
Name of Applicant: Actual Inventor: Hyundai Motor Company Woo Jik Lee Address for Service: Invention Title: Details of Basic Application: HODGKINSON McINNES PAPPAS Patent Trade Mark Attorneys Levels 3, 20 Alfred Street MILSONS POINT NSW 2061 "Method for Detecting Disconnection of an On Signal-Transmitting Line of an LPG Switch" Korea Patent Application No. 10-2005-0080173 Filed 30 August 2005 The following statement is a full description of this invention, including the best method of performing it known to us: P20499AU00 METHOD FOR DETECTING DISCONNECTION OF AN ON SIGNAL-TRANSMITTING LINE OF AN LPG SWITCH CROSS-REFERENCE TO RELATED APPLICATION This application claims priority to and the benefit of Korean Patent Application No. 10-2005-0080173 filed in the Korean Intellectual Property Office on August 30, 2005, the entire contents of which are incorporated herein by reference.
BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a method for detecting disconnection of an ON signal-transmitting line of an LPG switch. More particularly, The present invention relates to a method for detecting disconnection of an ON signal-transmitting line of an LPG switch having an advantage of distinguishing the disconnection from an actual operation "ON" state) of the LPG switch.
Description of the Related Art In general, a vehicle using liquefied petroleum gas (LPG) includes an LPG switch for preventing the LPG from being supplied to an engine from a fuel tank (cylinder), when an accident occurs.
Such an LPG switch is operated as follows. As shown in Fig. 1, if a driver pushes an LPG switch 10, since a driver power supply 4 which is respectively supplied to a shut-off solenoid valve 2a, a cut-off solenoid valve 2b, and a fuel pump is cut, the fuel pump is stopped, and the shut-off solenoid valve 2a and the cut-off solenoid valve 2b are closed. The shut-off solenoid valve and the cut-off solenoid valve are respectively positioned corresponding to the fuel cylinder and the engine. In addition, although the cut-off solenoid valve 2b is closed, fuel remaining in a fuel line near the engine allows the engine to be operated until the fuel is exhausted. Thereafter, the engine misfires due to the lack of fuel and stops.
Therefore, since the fuel is not purposefully supplied to the engine, when the engine is operated by the fuel remaining in the fuel line after the LPG switch is operated, fuel feed-back control, the fuel pump, and a malfunction diagnosis by an 02 sensor must be stopped. Accordingly, in order for an ECU to determine whether the LPG switch is operated, the LPG switch 10 is positioned on a control line of a fuel pump relay 6 such that the fuel pump relay may be turned off through an interface box 20, and in addition, an operation signal transmitting line A is provided for connecting the LPG switch to the interface box 20 such that an operation signal of the LPG switch is transmitted to the ECU therethrough.
However, it is difficult to determine whether the lack of operation signal is caused by actual operation of the LPG switch or by disconnection of the operation signal transmitting line, with the circuit shown in Fig. 1. That is, the ECU recognizes a disconnection of the operation signal transmitting line an open circuit state) and the actual operation of the LPG switch as the same. As a result, under the open circuit state, the ECU recognizes it as a state in which the driver has operated the LPG switch, so the ECU does not perform the feedback control but performs an open loop control, and it stops the fuel pump and a malfunction diagnosis by an 02 sensor. However, the fuel is continuously supplied. Accordingly, a problem occurs in that exhaust gas emissions may increase.
The above information disclosed in this Background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not form the prior art that is already known in this country to a person of ordinary skill in the art.
SUMMARY OF THE INVENTION The present invention has been made in an effort to provide a method for detecting disconnection of an ON signal-transmitting line of an LPG switch having advantages of distinguishing the disconnection from an actual operation "ON" state) of the LPG switch. An exemplary method for detecting disconnection of an ON signal-transmitting line of an LPG switch which is mounted on a vehicle for preventing fuel delivery, includes: starting the method; determining whether the LPG switch is operated, when an engine of the vehicle is in a stationary operation state; determining whether an ignition key is turned off after a fuel pump and a malfunction diagnosis by an 02 sensor is stopped, when the LPG switch is operated; operating a timer for determining whether the engine is operated, when the ignition key is an "ON" state; comparing the time of the timer with a reference time; adding to an error-sensing counter after determining a state that the ON signal-transmitting line is disconnected, when the time of the timer is more than the reference time; and returning to the starting of the method, after resetting the timer after an error code is input and a warning lamp is turned on, when the error sensing counter to which is added is maintained during a predetermined time.
In a further embodiment according to the present invention, the method further includes returning to the starting of the method after resetting the timer, when the LPG switch is not operated and the ignition key is in an "OFF" state.
In another further embodiment according to the present invention, the method further includes: comparing a present RPM with a reference RPM so as to determine whether the engine is stopped, when the time of the timer is less than the reference time; returning to the determining of whether the LPG switch is operated, when the present RPM is more than the reference RPM; and returning to the starting of the method after resetting the timer, when the present RPM is less than the reference RPM.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a conventional circuit for sensing an operation state of an LPG switch.
FIG. 2 is a flowchart showing a method for detecting disconnection of an ON signal-transmitting line of an LPG switch according to an exemplary embodiment of the present invention.
DETAILED DESCRIPTION OF THE EMBODIMENTS An exemplary embodiment of the present invention will hereinafter be described in detail with reference to the accompanying drawings.
A method for detecting disconnection of an ON signal-transmitting line of an LPG switch according to an exemplary embodiment of the present invention will hereinafter be described in detail with reference to FIG. 2.
The method for detecting disconnection of an ON signal-transmitting line of an LPG switch according to an exemplary embodiment of the present invention is for distinguishing the disconnection from an actual operation "ON" state) of the LPG switch. An engine is operated until fuel of a fuel line is exhausted if fuel delivery from a fuel cylinder is prevented by an actual operation of the LPG switch fuel. However, the engine is continuously operated until the ignition is off if the disconnection occurs on a circuit an ON signal-transmitting line). Accordingly, using such facts, whether the disconnection of the ON signal-transmitting line (refer to in Fig. 1) or the LPG switch is disconnected may be determined.
First, as shown in FIG. 2, an electric control unit (ECU) determines whether the LPG switch is operated, when an operation of the engine is a normal state at step S10. If the LPG switch is not operated at step 20, the timer is reset and the method is restarted. However, in a case that the LPG switch is operated, the ECU determines whether an ignition key is turned off after a fuel pump and a malfunction diagnosis by an oxygen (02) sensor is stopped, at steps to At step S50, if an ignition key is in an "OFF" state, the method is restarted after a timer is reset. However, in a case that the ignition key is in an "ON" state, the ECU, at step S60, operates the timer so as to determine whether the engine is stopped.
At step S60, the timer is operated, and thereafter the ECU compares the time of the timer with a predetermined reference time, at step S70. If the time of the timer is more than the reference time (about 5 minutes) and an operation of the engine is a normal state, the ON signal-transmitting line of the LPG switch is determined to be disconnected, and is added to the error sensing counter at step At the step S80, if the added error sensing counter is maintained during a predetermined time, an error code is input to the ECU and a warning lamp is turned on, at step S90. Thereafter, the timer is reset and the method is restarted.
In addition, at step 70, if the time of the timer is less than the reference time, that is, if the engine is stopped within the reference time, the ECU, at step S100, compares a present RPM with a reference RPM (about rpm, that is, when the ignition is on) so as to determine whether the engine is stopped. If the present RPM is determined to be more than the reference RPM, the method is performed again at the determining of whether the LPG switch is operated. In a case that the present RPM is determined to be less than the reference RPM, the engine is determined to be stopped, and the timer is reset and the method is restarted at step S110.
As above-mentioned, according to the method for detecting disconnection of an ON signal-transmitting line of an LPG switch, the ECU determines whether the operation of the LPG switch is in a normal state, if the engine is stopped within the reference time when the ON signal of the LPG switch is input to the ECU. However, the ECU determines that the ON signal-transmitting line is disconnected when the engine is normally operated although the reference time is past.
According to the method for detecting disconnection of an ON signal-transmitting line of an LPG switch, whether the operation of the LPG switch is in a normal state or whether the ON signal transmitting line of the LPG switch is disconnected can be determined, and accordingly the exhaust gas emissions can be prevented from increasing by turning on the warning lamp and the open loop control of the fuel.
While this invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
The term "comprising" (and its grammatical variations) as used herein is used in the inclusive sense of "having" or "including" and not in the exclusive sense of "consisting only of".

Claims (4)

1. A method for detecting disconnection of an ON signal-transmitting line of an LPG switch which is mounted on a vehicle for preventing fuel delivery, comprising: starting the method; determining whether the LPG switch is operated, when an engine of the vehicle is in a stationary operation state; determining whether an ignition key is tumrned off after a fuel pump and a malfunction diagnosis by an 02 sensor stop, when the LPG switch is operated; operating a timer for determining whether the engine is operated, when the ignition key is in an "ON" state; comparing the time of the timer with a reference time; adding to an error sensing counter after determining a state that the ON signal-transmitting line is disconnected, when the time of the timer is more than the reference time; and returning to the starting of the method, after resetting the timer after an error code is input and a warning lamp is turned on, when the error sensing counter to which is added is maintained during a predetermined time.
2. The method of claim 1, further comprising returning to the starting, after resetting the timer, when the LPG switch is not operated and the ignition key is in an "OFF" state.
3. The method of claim 1, further comprising: comparing a present RPM with a reference RPM so as to determine whether the engine is stopped, when the time of the timer is less than the reference time; returning to the determining of whether the LPG switch is operated, when the present RPM is more than the reference RPM; and returning to the starting of the method after resetting the timer, when the present RPM is less than the reference RPM.
4. A method for detecting disconnection of an ON signal-transmitting line of an LPG switch which is mounted on a vehicle for preventing fuel delivery as substantially hereinbefore described and with reference to Figure 2. Dated this 27 th day of April 2006. Hvundai Motor Company By: HODGKINSON MclNNES PAPPAS Patent Attorneys for the Applicant
AU2006201753A 2005-08-30 2006-04-27 Method for Detecting Disconnection of an On Signal-Transmitting Line of an LPG Switch Ceased AU2006201753B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020050080173A KR100716314B1 (en) 2005-08-30 2005-08-30 How to Detect Loss of LP Switch Line
KR10-2005-0080173 2005-08-30

Publications (2)

Publication Number Publication Date
AU2006201753A1 AU2006201753A1 (en) 2007-03-15
AU2006201753B2 true AU2006201753B2 (en) 2008-02-14

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AU2006201753A Ceased AU2006201753B2 (en) 2005-08-30 2006-04-27 Method for Detecting Disconnection of an On Signal-Transmitting Line of an LPG Switch

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JP (1) JP4324602B2 (en)
KR (1) KR100716314B1 (en)
CN (1) CN100412342C (en)
AU (1) AU2006201753B2 (en)
IT (1) ITMI20060837A1 (en)
NL (1) NL1031695C2 (en)

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CN101644199B (en) * 2009-09-02 2013-01-23 武汉理工大学 Method and device for simulating faults of zirconia-type oxygen sensor for electronic injection engine
US7769534B1 (en) * 2009-10-13 2010-08-03 Gm Global Technology Operations, Inc. Asymmetrical oxygen sensor diagnostic and degradation compensation systems
CN102390323B (en) * 2011-08-09 2013-11-06 联合汽车电子有限公司 Fault detection method for vehicle steering lamp
US9931956B2 (en) * 2015-12-30 2018-04-03 Thunder Power New Energy Vehicle Development Company Limited Battery management system

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Patent Citations (3)

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Publication number Priority date Publication date Assignee Title
JP2004124710A (en) * 2002-09-30 2004-04-22 Nissan Diesel Motor Co Ltd Gas engine
US20050193992A1 (en) * 2004-03-04 2005-09-08 Chang Hyun Shin Fuel pump noise reducing apparatus and method thereof for liquefied petroleum injection vehicle
US7127941B2 (en) * 2004-04-29 2006-10-31 Hyundai Motor Company Diagnosis system for liquefied petroleum injection fuel pump

Also Published As

Publication number Publication date
KR100716314B1 (en) 2007-05-11
NL1031695C2 (en) 2008-09-29
CN1924331A (en) 2007-03-07
JP2007064205A (en) 2007-03-15
ITMI20060837A1 (en) 2007-02-28
NL1031695A1 (en) 2007-03-01
KR20070028665A (en) 2007-03-13
CN100412342C (en) 2008-08-20
AU2006201753A1 (en) 2007-03-15
JP4324602B2 (en) 2009-09-02

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