KR101232430B1 - Method for fuel pressure sensor and canister closevalve fail detect - Google Patents

Method for fuel pressure sensor and canister closevalve fail detect Download PDF

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Publication number
KR101232430B1
KR101232430B1 KR20060090762A KR20060090762A KR101232430B1 KR 101232430 B1 KR101232430 B1 KR 101232430B1 KR 20060090762 A KR20060090762 A KR 20060090762A KR 20060090762 A KR20060090762 A KR 20060090762A KR 101232430 B1 KR101232430 B1 KR 101232430B1
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South Korea
Prior art keywords
fuel tank
tank pressure
close valve
pressure sensor
canister close
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KR20060090762A
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Korean (ko)
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KR20080025938A (en
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조상범
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현대자동차주식회사
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    • 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)
  • Supplying Secondary Fuel Or The Like To Fuel, Air Or Fuel-Air Mixtures (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)

Abstract

The present invention relates to a failure determination method of a canister close valve and a fuel tank pressure sensor, and an air filter aging index (AFage) using the fuel tank pressure (FTPSvol) measured by the fuel tank pressure sensor in a state in which the canister close valve is opened. And calculating the operation of the purge control valve, and if the purge control valve is on, at the failure determination pressure Th1 set for the failure determination of the canister close valve, the air filter Multiplying the aging index (AFage) to correct the canister close valve fault determination value (Th1 * AFage), and the measured fuel tank pressure (FTPSvol) is less than the corrected canister close valve fault determination value (Th1 * AFage). When the measured fuel tank pressure FTPSvol is smaller than the fuel tank pressure Th2 set when the canister close valve is closed, the fuel tank pressure sensor is turned on. If it is determined that the fuel tank pressure FTPSvol is greater than the set fuel tank pressure Th2, it is determined that the canister close valve is broken, and the canister close valve and the fuel tank are introduced by introducing an aging frequency of the air filter. There is an advantage to increase the reliability when determining the failure of the pressure sensor.

Canister Close Valve, Fuel Tank Pressure Sensor, Canister, Purge Control Valve, Air Filter

Description

Fault determination method of canister close valve and fuel tank pressure sensor {METHOD FOR FUEL PRESSURE SENSOR AND CANISTER CLOSEVALVE FAIL DETECT}

1 is a block diagram of a fault determination device of the canister close valve and the fuel tank pressure sensor according to the present invention;

2 is a flowchart illustrating a failure determination method of the canister close valve and the fuel tank pressure sensor according to the present invention.

DESCRIPTION OF THE REFERENCE NUMERALS

50: fuel tank 51: fuel inlet

60: canister 70: purge control valve

80: canister close valve 90: air filter

100: fuel tank pressure sensor

The present invention relates to a failure determination method of a canister close valve and a fuel tank pressure sensor, and in particular, a fuel tank pressure sensor (FTPS) and a canister close valve (Canister Close) necessary for determining whether a fuel system of a vehicle is leaked. Valve: CCV) How to determine if there is a failure.

In general, the boil-off gas temporarily stores the vapor of gasoline evaporated from the fuel tank in the canister and sends it to the intake tube when the engine rotates to combust the fuel tank pressure sensor (FTPS), which detects the pressure of the fuel tank. The canister close valve (CCV), which shuts down the vehicle's fuel system and the atmosphere to keep the canister closed, plays an important role in leak monitoring to respond to evaporative gas protection regulations.

In addition, the fuel tank pressure sensor (FTPS) is also used to diagnose the failure of the canister close valve (CCV), the failure diagnosis of the fuel tank pressure sensor (FTPS) and the failure diagnosis of the canister close valve (CCV) are all fuel tank pressure sensor. It is processed according to the pressure of the fuel tank which is an input signal of (FTPS).

In the prior art, the method for determining the failure of the fuel tank pressure sensor (FTPS) and the canister close valve (CCV) has a constant output value of the fuel tank pressure sensor (FTPS) when the operation state of the purge control valve (PCV) is "on". If it is smaller than the value P1, the canister close valve (CCV) fault determination step, which is judged to be a fault in which the pressure is blocked due to the clogged canister close valve (CCV), and the operation state of the purge control valve (PCV) If the output value of the fuel tank pressure sensor (FTPS) is less than the fuel tank pressure (P2) when the canister close valve (CCV) is clogged when the fuel tank pressure sensor (FTPS) is judged to be a failure of the fuel tank pressure sensor (FTPS) It consists of a fault determination stage.

However, a failure determination method of the fuel tank pressure sensor (FTPS) and the canister close valve (CCV) according to the related art configured as described above, when the purge control valve is in operation and the canister close valve is completely blocked, the pressure of the fuel tank is reduced. Since the canister close valve may be smaller than the fuel tank pressure P2 in a blocked state, there is a problem in that the fuel tank pressure sensor may be incorrectly determined.

In addition, there is a problem in that an unrealistic value is output as a problem of the internal circuit of the fuel tank pressure sensor so that the pressure of the fuel tank is output small so that it can be determined that the canister close valve is broken.

In addition, there is a problem that the air filter may be determined as a failure of the canister close valve or the fuel tank pressure sensor when the air resistance is enlarged due to contamination by dust moisture or the like.

It is an object of the present invention to provide a failure determination method of a canister close valve and a fuel tank pressure sensor by introducing an aging index of an air filter.

In order to solve the above problems, the present invention includes the steps of calculating the air filter aging index (AFage) using the fuel tank pressure (FTPSvol) measured by the fuel tank pressure sensor in the state that the canister close valve is open, and purge control And determining whether the valve is operated, and if the purge control valve is turned on, multiplying the air filter aging index AFage by a failure determination pressure Th1 set for fault determination of the canister close valve. When the canister close valve failure determination value Th1 * AFage is corrected and the measured fuel tank pressure FTPSvol is smaller than the corrected canister close valve failure determination value Th1 * AFage, the measured fuel tank pressure ( FTPSvol) is less than the fuel tank pressure Th2 set when the canister close valve is closed, it is determined that the fuel tank pressure sensor has failed, and the measured fuel tank pressure (FTPSvol) is greater than the pressure (Th2) is set the fuel tank, there is provided a failure determination method of the canister close valve, and a fuel tank pressure sensor which determines that a failure the canister close valve.

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Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a fault determination device of the canister close valve and the fuel tank pressure sensor according to the present invention;

2 is a flowchart illustrating a failure determination method of the canister close valve and the fuel tank pressure sensor according to the present invention.

The fault determination device of the canister close valve and the fuel tank pressure sensor according to the present invention, as shown in Figure 2, the canister 60 for collecting the boil-off gas generated in the fuel tank 50, and the boil-off gas to the engine The purge control valve (PCV, 70) for adjusting the inflow amount, the canister close valve (CCV, 80) for controlling the outside air supplied to the canister (60), and the canister close valve (80) is connected to the An air filter 90 for filtering impurities, a fuel tank pressure sensor (FTPS) 100 for measuring the evaporation gas pressure of the fuel tank, the purge control valve and the canister close valve and controlling the output of the fuel tank pressure sensor It is composed of an engine control unit (Engine Control Unit, not shown) receiving the input.

One side of the fuel tank 50 is connected to the fuel injection pipe 51 is injected fuel.

The engine control apparatus is connected to a vehicle driving state detection device that detects a signal that is variable and output according to a driving state of the vehicle.

In addition, the engine control device is connected to a driving device for displaying a failure indication to the driver in accordance with a predetermined warning signal output from the engine control device.

The vehicle driving state detecting apparatus includes an engine speed detector for detecting an engine speed, an engine load detector for detecting an engine load, a fuel tank pressure detector for detecting a pressure in the fuel tank, and a fuel tank temperature for detecting a temperature in the fuel tank. The detector is composed of a purge control valve operating state detector for detecting an operating state of the purge control valve.

Hereinafter, the operation of the present invention will be described.

The failure judging method of the canister close valve 80 and the fuel tank pressure sensor 100 according to the present invention is as shown in Figure 2, the fuel tank pressure sensor 100 in a state in which the canister close valve 80 is open; Air filter aging determination step (S120) for determining whether the air filter is aging according to the aging index (AFage) of the air filter obtained using the measured fuel tank pressure (Th1) and whether the purge control valve 70 is operated Determining the failure of at least one of the purge control valve operation determination step (S130) and the canister closed valve 80 or the fuel tank pressure sensor 100 according to the operation state of the purge control valve 70 to determine. It is made to include.

That is, in the driving state of the vehicle, the vehicle driving state detection unit detects the engine speed, the engine load, the pressure in the engine tank, the temperature in the engine tank, and outputs a signal to the engine control device (S100). Perform.

The engine control apparatus calculates the duty of the purge control valve 70 according to the signal received from the driving state detection unit, and the duty of the purge control valve 70, the temperature in the engine tank, the engine speed, and the engine load are the canisters. A vehicle driving state determination step (S110) is performed to determine whether the close valve 80 and the fuel tank pressure sensor 100 correspond to a region in which failure determination is to be performed.

Of course, the duty of the purge control valve 70, the temperature in the engine tank, the engine speed and the reference value of the engine rod is stored in the engine control device and measured the duty of the purge control valve 70, the temperature in the engine tank, When the engine speed and the engine rod value fall within the range of the reference value, a failure determination step of the canister close valve 80 and the fuel tank pressure sensor 100 is performed.

When it is determined that the fault determination of the canister close valve 80 and the fuel tank pressure sensor 100 should be performed in the vehicle driving state determination step S110, the air filter aging determination step S120 is performed.

In the air filter aging determination step 120, an aging index (AFage) of the air filter is calculated.

The aging index AFage of the air filter is expressed as the ratio of the fuel tank pressure FTPSvol at the measurement to the fuel tank pressure set when a new air filter is used. That is, the aging index AFage of the air filter = [(fuel tank pressure at measurement (FTPSvol) / (fuel tank pressure at the time of using a new air filter)]].

The fuel tank pressure when the new air filter is used may be measured in advance and input to the engine controller.

When the aging index of the air filter is greater than a predetermined value AFth, it may be determined that the air filter is contaminated by dust, oil, etc., and excessive negative pressure is applied to the fuel tank.

Therefore, when it is determined that the air filter is aging, an air filter replacement indication S170 is displayed on the driving device by a signal of the engine control device.

If the air filter aging index AFage is smaller than the specific value AFth, it is determined that the air filter 90 can continue to be used, and a purge control valve operation determining step S130 is performed.

In the purge control valve operation step (S130), it is determined whether the purge control valve 70 is operating, that is, in an on or off state.

When the purge control valve 70 is in the "on" state in the purge control valve operation step (S130), the canister close valve failure determination step (S140) is performed.

In the canister close valve failure determination step (S140), the canister close valve failure determination value (Th1 * AFage) and the fuel tank pressure measured by correcting the preset failure determination pressure Th1 according to the air filter aging index AFage are measured. FTPSvol).

The canister close valve failure determination value Th1 * AFage refers to the measured [preset failure determination pressure Th1] * [air filter aging index AFAF].

That is, the influence on the contamination of the air filter may be excluded by multiplying the predetermined failure determination pressure Th1 by the air filter aging index AFage.

If the measured fuel tank pressure FTPSvol is smaller than the corrected canister close valve failure determination value Th1 * AFage, the fuel tank pressure sensor failure determination step S150 is performed.

In the fuel tank pressure sensor failure determination step (S150), the measured fuel tank pressure FTPSvol and the fuel tank pressure Th2 set when the canister close valve 80 is completely closed are compared.

The fuel tank pressure Th2 when the canister close valve 80 is completely closed may be measured in advance and input to the engine controller.

When the measured fuel tank pressure FTPSvol is smaller than the fuel tank pressure Th2 when the canister close valve 80 is completely closed in the fuel tank pressure sensor failure determining step, the fuel tank pressure sensor 100 Is determined to be a failure, the fuel tank pressure sensor failure display step (S190) is performed, indicating a failure of the fuel tank pressure sensor 100, the measured fuel tank pressure (FTPSvol) is the canister close valve (80) ) Is greater than the fuel tank pressure Th2 in a completely closed state, the canister close valve 80 is determined to be a failure, and a fault display step S180 of the canister close valve is performed, whereby the canister close valve ( 80) is displayed.

On the other hand, when the purge control valve 70 is in the "off" state in the purge control valve operation step (S130), the fuel tank pressure sensor failure determination step (S160) is performed.

When the fuel tank pressure FTPSvol measured in the fuel tank pressure sensor failure determination step S160 is smaller than the fuel tank pressure Th2 when the canister close valve 80 is completely closed, the fuel tank pressure Determining that the sensor 100 is a failure, the fuel tank pressure sensor failure display step (S190) is performed to display the failure of the fuel tank pressure sensor 100.

The fault determination method of the canister close valve and the fuel tank pressure sensor according to the present invention configured as described above has an advantage of increasing reliability when determining the fault of the canister close valve and the fuel tank pressure sensor by introducing an aging frequency of the air filter. have.

In addition, there is an advantage in that the failure determination process of the canister close valve and the fuel tank pressure sensor can be distinguished more accurately.

In addition, there is an advantage to prevent costly maintenance of the canister close valve and the fuel tank pressure sensor to increase the cost reduction and maintenance convenience.

Claims (5)

Calculating an air filter aging index (AFage) using the fuel tank pressure FTPSvol measured by the fuel tank pressure sensor while the canister close valve is opened; And And determining whether the purge control valve is operated. If the purge control valve is on, The fault determination pressure Th1 set for fault determination of the canister close valve is multiplied by the air filter aging index AFage to correct the canister close valve fault determination value Th1 * AFage, and the measured fuel tank pressure. If (FTPSvol) is less than the corrected canister close valve fault determination value (Th1 * AFage), If the measured fuel tank pressure FTPSvol is smaller than the fuel tank pressure Th2 set when the canister close valve is closed, it is determined that the fuel tank pressure sensor has failed, and the measured fuel tank pressure FTPSvol is A failure judging method of the canister close valve and the fuel tank pressure sensor which determine that the canister close valve is a failure when it is greater than the set fuel tank pressure Th2. The method according to claim 1, And the air filter aging index AFage is a ratio of the measured fuel tank pressure FTPSvol to the set fuel tank pressure when the air filter is a new air filter. The method according to claim 1, If the air filter aging index (AFage) is greater than the set specific value (AFth), indicating the replacement of the air filter; failure detection method of the canister close valve and fuel tank pressure sensor further comprising. The method according to claim 1, If it is determined that the fuel tank pressure sensor is faulty, indicating a failure of the fuel tank pressure sensor; If it is determined that the canister close valve is broken, indicating the failure of the canister close valve further comprises the step of indicating the failure of the canister close valve and the fuel tank pressure sensor. The method according to claim 1, If the purge control valve is off, If the measured fuel tank pressure (FTPSvol) is less than the set fuel tank pressure (Th2), the failure determination method of the canister close valve and the fuel tank pressure sensor to determine that the fuel tank pressure sensor failure.
KR20060090762A 2006-09-19 2006-09-19 Method for fuel pressure sensor and canister closevalve fail detect KR101232430B1 (en)

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KR20060090762A KR101232430B1 (en) 2006-09-19 2006-09-19 Method for fuel pressure sensor and canister closevalve fail detect

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Application Number Priority Date Filing Date Title
KR20060090762A KR101232430B1 (en) 2006-09-19 2006-09-19 Method for fuel pressure sensor and canister closevalve fail detect

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KR101232430B1 true KR101232430B1 (en) 2013-02-12

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015212533A (en) * 2014-05-07 2015-11-26 愛三工業株式会社 Evaporated fuel treatment device
JP6597661B2 (en) * 2017-02-07 2019-10-30 トヨタ自動車株式会社 Pressure sensor abnormality diagnosis device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20020051776A (en) * 2000-12-23 2002-06-29 이계안 Method for fuel pressure sensor and canister close valve fail detect of vehicle
KR20060062383A (en) * 2004-12-03 2006-06-12 현대자동차주식회사 Cannister air-filter pollution diagnosis method

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20020051776A (en) * 2000-12-23 2002-06-29 이계안 Method for fuel pressure sensor and canister close valve fail detect of vehicle
KR20060062383A (en) * 2004-12-03 2006-06-12 현대자동차주식회사 Cannister air-filter pollution diagnosis method

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