KR101913220B1 - Method and apparatus for diagnosing purge valve of vehicle - Google Patents

Method and apparatus for diagnosing purge valve of vehicle Download PDF

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Publication number
KR101913220B1
KR101913220B1 KR1020120095267A KR20120095267A KR101913220B1 KR 101913220 B1 KR101913220 B1 KR 101913220B1 KR 1020120095267 A KR1020120095267 A KR 1020120095267A KR 20120095267 A KR20120095267 A KR 20120095267A KR 101913220 B1 KR101913220 B1 KR 101913220B1
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South Korea
Prior art keywords
fuel pressure
pressure switch
purge valve
engine
fuel
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KR1020120095267A
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Korean (ko)
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KR20140028634A (en
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김한신
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콘티넨탈 오토모티브 시스템 주식회사
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Priority to KR1020120095267A priority Critical patent/KR101913220B1/en
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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

Abstract

The present invention discloses a method and apparatus for diagnosing a purge valve in a vehicle. According to the present invention, when the fuel pressure switch is connected in the ON state as the fuel pressure which decreases in accordance with the ambient temperature changes after the engine is stopped falls below a predetermined pressure, it is determined that the purge valve is open and fixed, If the degree of fixation of the purge valve is determined based on the amount of change in the ambient temperature after engine startup and the connection position of the fuel pressure switch and the connection position of the fuel pressure switch, the purge valve is opened and fixed It is possible to reduce the fixing diagnosis time of the purge valve to a minimum, and the fuel leakage diagnosis is performed after the determination of the fixing of the purge valve is performed, so that the reliability of the fuel leakage diagnosis result can be improved.

Description

TECHNICAL FIELD [0001] The present invention relates to a method and an apparatus for diagnosing a purge valve in a vehicle,

The present invention relates to a method and an apparatus for diagnosing a purge valve in a vehicle, and more particularly, to a method and an apparatus for diagnosing a purge valve in a vehicle, To a fuel pressure switch connection position that is received after the start of the engine, and to a determination of the open / close adherence of the purge valve based on the fuel pressure switch connection time before the purge valve is controlled after engine starting.

In recent years, exhaust gas regulations for automobiles have been strictly applied globally in the North American market. Regulations have been imposed on vehicles operating in North America such that the function of monitoring the fuel system leaks is essential to the engine control system (OBD-II).

This is to minimize the air pollution by preventing the evaporated fuel from being discharged into the atmosphere by lighting the warning lamp when leakage of the evaporative gas occurs in the fuel system leakage in the field.

In the conventional leak diagnosis of the fuel tank during engine stop, the negative pressure in the fuel tank is formed through the control of the canister purge valve, and then the leakage diagnosis in the fuel tank is executed based on the change of the fuel pressure in the fuel tank through the control of the purge valve.

In other words, the purge valve is one of the important parts for diagnosing the fuel leak, and the fixing error of the purge valve is one of the reasons that reliability of the fuel leak diagnosis is deteriorated.

However, in the case of such a purge valve sticking error diagnosis, the fuel pressure of the fuel tank is monitored by the rising fuel pressure after forming the negative pressure, and when the fuel pressure signal of the pressure sensor falls below the limit value during the large- After the valve is closed, it is diagnosed based on the fuel pressure change of the fuel tank.

That is, only when the large-scale leak diagnosis condition of the fuel tank is satisfied, it is determined whether or not there is an abnormality in the canister valve and the purge valve, so that it is not possible to diagnose the abnormality of the canister valve and the purge valve.

Further, since the diagnosis of the fixing error of the purge valve is made based on the fuel pressure change rate which is increased after the fuel pressure of the fuel tank is formed into the negative pressure, the diagnosis of the fuel leak and the error diagnosis of the purge valve take a long time.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a fuel pressure switch which is connected to a hot state when the fuel pressure in the fuel tank falls to a predetermined value, The fuel pressure switch connection position received when the fuel pressure of the fuel tank is reduced to the natural negative pressure to be formed, the fuel pressure switch connection position received after the engine is started, and the fuel pressure reduced through the opening control of the purge valve after engine startup And a diagnostic control unit for determining whether the purge valve is open or closed based on the fuel pressure switch connection time to the purge valve. The time can be shortened to a minimum.

According to a first aspect of the present invention, there is provided a method for diagnosing a purge valve for a vehicle,

a) receiving, at the diagnosis control section, a fuel pressure switch connection position which is connected to the on-state at a point of time when the engine pressure has ceased and the fuel pressure in the fuel tank falls to a predetermined value; And

b) determining that the purge valve is open and fixed when the fuel pressure switch connection position is in the ON state.

Preferably, the method further comprises:

c) if the fuel pressure switch connection position is not connected in an ON state, receiving outdoor air temperature after starting the engine to derive an ambient air temperature variation during engine stop and storing the outdoor air temperature change;

d) starting counting of the timer after the engine start and terminating the counting of the timer when the fuel pressure switch connection position is received in an ON state, thereby deriving the fuel pressure switch connection time after engine startup;

e) determining whether the engine has stabilized after starting the engine, and deriving a determination reference time based on the fuel level, the intake air amount, and the ambient temperature change amount when the engine is stabilized;

f) comparing the connection time of the fuel pressure switch with a preset reference time, and determining the degree of fixation of the purge valve according to the comparison result.

Preferably, the step of determining the degree of open-

f-1) determining that the purge valve open adhesion degree is small-scale open adhesion when the fuel pressure switch time exceeds the determination reference time; And

f-2) determining that the purge valve open fixation degree is a large-scale open fixation when the fuel pressure switch time does not exceed the determination reference time.

Preferably,

g) if the fuel pressure switch is not connected in the on state, the count value of the timer is received; and if the count value of the timer exceeds the predetermined time, the purge valve is determined not to be fixed The method comprising the steps of:

Preferably,

h) If the count value of the timer received in the step g) does not exceed the predetermined time, it is determined whether the outdoor air temperature change rate in the step c) is within a predetermined threshold range, And determining that the purge valve fixing diagnosis is not possible if the purge valve fixing diagnosis is not within the range.

Technical Solution According to another aspect of the present invention,

A fuel pressure switch for outputting a fuel pressure switch connection position in an on state when the fuel pressure of the fuel tank reaches a predetermined pressure;

And the diagnosis control unit determines that the purge valve is open and fixed when the fuel pressure switch connection position is on when the fuel pressure in the fuel tank is formed to a natural negative pressure according to the ambient temperature lowered after stopping the engine.

Preferably,

Counting is started after stopping the engine and counting is performed when the fuel pressure switch connection position is received when the fuel pressure of the fuel tank reaches a preset predetermined pressure and the fuel pressure switch connection position and the fuel pressure switch connection time are derived A timer;

Further comprising an outside air temperature sensor for receiving the outside air temperature after the engine is stopped and the outside air temperature after starting the engine to derive the outside air temperature variation during the engine stop,

Wherein the diagnosis control unit comprises:

The fuel pressure switch connection time, the fuel pressure switch connection time, and the ambient temperature change amount of the outside air temperature sensor, which are count values of the timer received after the engine is started.

Preferably, the diagnosis control unit includes:

The air conditioner receives the ambient temperature of the outdoor air temperature sensor before and after starting the engine to derive and store the ambient temperature variation,

Counting the timer after the engine is started and stopping the counting of the timer when the fuel pressure switch connection position is on, deriving the fuel pressure switch connection time, which is the count value of the timer,

A determination reference time is derived based on the fuel level, the intake air amount, and the ambient temperature change amount supplied from the outside when the engine is stabilized,

The fuel pressure switch connection time of the timer is compared with the determination reference time and the degree of fixation of the purge valve is determined based on the comparison result.

Preferably, the degree of purging of the purge valve

When the fuel pressure switch connection time of the timer exceeds the determination reference time, it is determined that the small purge valve is open and fixed,

When the fuel pressure switch connection time of the timer does not exceed the determination reference time, it may be determined that the large-scale purge valve is open and fixed.

Preferably, the diagnosis control unit includes:

And determining that there is no fixing error of the forge valve when the fuel pressure switch connection time of the timer exceeds a predetermined time period.

Preferably, the diagnosis control unit includes:

When the fuel pressure switch connection time of the timer does not exceed the predetermined time, it is determined that the fixing error diagnostic of the purge valve is not possible if the ambient temperature change amount is not within the predetermined threshold range.

As described above, the method and apparatus for diagnosing a purge valve of a vehicle according to an embodiment of the present invention are characterized in that the fuel pressure switch is turned on as the fuel pressure, which decreases as the ambient temperature changes after the engine is stopped, When the fuel pressure switch is not connected in the ON state, it is determined that the purge valve is open and fixed. Based on the change in the ambient temperature after engine startup and the connection position of the fuel pressure switch and the connection position of the fuel pressure switch, Therefore, it is possible to reduce the fixing time of the purge valve to a minimum by judging whether the purge valve is open or closed based on the fuel pressure which is reduced after forming by the natural negative pressure, and the fuel leak diagnosis is executed after the purge valve is fixed. Thereby obtaining an effect of improving the reliability.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate preferred embodiments of the invention and, together with the description of the invention given below, serve to further understand the technical idea of the invention. And should not be construed as limiting.
1 is a view showing the configuration of a purge valve diagnostic apparatus for a vehicle according to an embodiment of the present invention.
2 is a flowchart illustrating a purge valve diagnosis process of a vehicle according to an embodiment of the present invention.

In order to fully understand the present invention, operational advantages of the present invention, and objects achieved by the practice of the present invention, reference should be made to the accompanying drawings and the accompanying drawings which illustrate preferred embodiments of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the preferred embodiments of the present invention with reference to the accompanying drawings. Like reference symbols in the drawings denote like elements.

1 is a view showing a purge valve diagnostic apparatus for a vehicle according to an embodiment of the present invention. A purge valve diagnostic apparatus for a vehicle according to an embodiment of the present invention will be described by way of example only with reference to the purge valve diagnostic apparatus shown in Fig.

The purge valve diagnostic apparatus for a vehicle to which the embodiment of the present invention is applied judges that the purge valve is open and fixed when the fuel pressure switch is connected in the ON state as the fuel pressure which decreases in accordance with the ambient temperature changes after the engine stops, When the fuel pressure switch is not connected in the ON state, determines the degree of the degree of opening and closing of the purge valve based on the amount of change in the outside air temperature after engine startup and the connecting position of the fuel pressure switch and the connecting position of the fuel pressure switch. A pressure switch 10, an outside air temperature sensor 20, a timer 30, a diagnosis control unit 40 and a display unit 50.

The fuel pressure switch 10 is provided at a predetermined position of the intake manifold so as to be connected to the ON state when the fuel pressure of the fuel tank to be lowered reaches a predetermined pressure, thereby generating the fuel pressure switch connecting position. The fuel pressure switch connection position is provided to the diagnosis control section (40).

The outside air temperature sensor 20 measures the outside air temperature after the engine is stopped and after the engine is started, and provides the measured outside air temperature to the diagnosis control unit 40. The diagnosis control unit 40 calculates the outside air temperature change rate .

The timer 30 starts counting after starting the engine and ends the counting when the fuel pressure switch connection position in the ON state from the fuel pressure switch 10 is received to derive the fuel pressure switch connection time as the count value . The fuel pressure switch connection time is provided to the diagnosis control unit (40).

When the fuel pressure switch connection position in the ON state after the engine is stopped is received, the diagnosis control unit (40) determines that the purge valve is open and fixed, and supplies the determination result to the display unit (50).

When the fuel pressure switching connection signal in the ON state at the time of engine stop is not received, the diagnosis control unit (40) determines the fuel pressure switch connection position, the fuel pressure switch connection time, The degree of opening of the purge valve is determined based on the amount of change in the outside air temperature of the outside air temperature sensor.

That is, the diagnosis control unit 40 receives the outside air temperature of the outside air temperature sensor after engine startup to derive the outside air temperature change amount, stops the driving of the timer when the fuel pressure switch connecting position is on, And when the engine is stabilized, derives a judgment reference time based on the fuel level, the intake air amount, and the ambient temperature change amount supplied from the outside, and determines the fuel pressure switch connection time of the timer and the judgment The reference time is compared and the degree of fixation of the purge valve opening is determined based on the comparison result.

For example, when the fuel pressure switch connection time of the timer exceeds the determination reference time, the degree of the purging of the purge valve is determined as a small purge valve open adhesion, and the fuel pressure switch connection time of the timer If it is not exceeded, the degree of openness of the purge valve is determined by the large-scale purge valve open adhesion.

Here, the determination reference time is a result value obtained through a plurality of experiments according to the fuel level, the intake air amount, and the ambient temperature change amount, and includes a table value (interpolation table value) corresponding to the fuel level, the intake air amount, .

When the fuel pressure switch connection time of the timer 30 exceeds a predetermined time (normally set to 5 minutes), the diagnosis control unit 40 determines that there is no fixing error of the purge valve, (50).

If the fuel pressure switch connection time of the timer 30 does not exceed the predetermined time, the diagnosis control unit 40 determines that the ambient temperature change amount does not exist within a predetermined threshold range (typically 6-8 degrees Celsius) , It is determined that the fixing error of the purge valve can not be diagnosed, and the determination result is provided to the display unit (50).

Here, the predetermined time and the critical range are results obtained through a number of experiments, and are stored in advance as calibration data for accurate diagnosis of the purge valve.

According to this configuration, when the fuel pressure switch connection position in the ON state is received as the fuel pressure that decreases in accordance with the ambient temperature change after the engine is stopped falls below the predetermined pressure, the diagnosis control section 40 determines that the purge valve is open and fixed, When the on-state fuel pressure switch connection position is not received, the degree of opening of the purge valve is determined based on the outside-air temperature change amount, the fuel pressure switch connection position, and the fuel pressure switch connection time after engine startup. When the fuel pressure switch connection time of the timer 30 exceeds a predetermined time, the diagnosis control unit 40 determines that the purge valve is not open and fixed. When the fuel pressure switch connection time of the timer 30 reaches a predetermined time , It is judged that diagnosis of the purge valve fixing diagnosis is impossible based on the change of the ambient temperature.

According to the embodiment of the present invention, when the fuel pressure switch is connected in the ON state as the fuel pressure which decreases in accordance with the ambient temperature change after stopping the engine falls below the predetermined pressure, it is determined that the purge valve is open and fixed, The degree of fixation of the purge valve is determined based on the amount of change in the outside air temperature after engine startup and the connection position of the fuel pressure switch and the connection position of the fuel pressure switch, It is possible to reduce the fixing diagnosis time of the purge valve to a minimum and improve the reliability of the fuel leak diagnosis result since the fuel leak diagnosis is executed after the determination of the fixing of the purge valve is executed.

When the fuel pressure switch is connected in the ON state as the fuel pressure which decreases in accordance with the ambient temperature change after the engine stop is decreased to a predetermined value or less, it is determined that the purge valve is open and fixed. When the fuel pressure switch is not connected in the ON state, A series of processes for determining the degree of fixation of the purge-valve opening based on the amount of change in the ambient air temperature, the connection position of the fuel pressure switch, and the connection position of the fuel pressure switch will be described in more detail with reference to FIG.

FIG. 2 is a flow chart showing the operation of the purge valve diagnostic apparatus of the vehicle shown in FIG. 1, and the purge valve diagnosis process according to the embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG.

First, in step 101, the diagnosis control unit 40 receives the outside air temperature from the outside air temperature sensor 20, the fuel pressure of the fuel tank is formed into a natural negative pressure in accordance with the outside air temperature lowered after the engine is stopped in step 101, It is determined whether the fuel pressure switch connection position supplied from the fuel pressure switch 10 is in an on state (step 103).

When the fuel pressure connection position in the on state is received in step 103, the diagnosis control unit 40 determines that the fuel pressure of the fuel tank has reached the predetermined pressure due to the open / It is determined that the purge valve is open and fixed (steps 105 and 107).

If the fuel pressure switch connection position is not on, the diagnosis controller 40 receives the ambient temperature of the ambient temperature sensor 20 after engine startup (step 111).

At this time, the diagnosis control unit 40 derives the ambient temperature change amount based on the outdoor air temperature of the step (103) and the outdoor air temperature difference of the step (109) through step 113 and stores it.

The diagnosis control unit 40 starts the counting by driving the timer 30 at the step 115 and judges whether the fuel pressure switch connection position supplied from the fuel pressure switch 10 is in an on state (Step 117).

When the fuel pressure switch connection position is turned on in step 117, the diagnosis controller 40 stops counting the timer 30 and then receives the fuel pressure switch connection time, which is the count value of the timer 30, (Steps 119 and 121).

Thereafter, the diagnosis control unit 40 determines whether the engine is stabilized at step 123, and derives a preset reference time based on the fuel level, the intake air amount, and the ambient temperature change amount when the engine is stabilized (step 125 ).

That is, when the amount of change in the engine revolution speed, the intake air amount, the ignition angle, and the fuel injection amount counter per unit time is within the allowable value, the diagnosis control unit 30 determines that stabilization is achieved through the step 123 after starting the engine.

Here, the series of processes for determining whether the engine has stabilized after the start of the engine is a well-known technique, and a detailed description thereof will be omitted.

When the fuel pressure switch connection time exceeds the determination reference time, the diagnosis control unit 40 determines that the degree of opening of the purge valve is small and determines that the small-size purge valve is open, and the determination result is provided to the display unit 50 (Steps 127 and 129).

If it is determined in step 127 of the diagnosis control unit 40 that the fuel pressure switch connection time exceeds the determination reference time, it is determined that the degree of opening of the purge valve is large and it is determined that the large size purge valve is open (step 131)

On the other hand, if it is determined in step 117 that the fuel pressure switch connection position is not in the ON state, the routine proceeds to step 133 to determine whether the count value of the timer 30 has passed the predetermined time (5 minutes) The process advances to step 135, and in step 135, the diagnosis control section 40 determines that there is no purge valve open fixation.

If the counted value of the timer 30 does not pass the predetermined time in step 133, the diagnosis control unit 40 determines whether the rate of change of the outdoor air temperature is within a predetermined threshold range (6-8 degrees Celsius) (Step 139). If the outdoor air temperature change rate is not within the critical range as a result of the determination, it is determined that the purge valve fixing diagnosis is impossible (step 141).

According to the embodiment of the present invention, when the fuel pressure switch is connected in the ON state as the fuel pressure which decreases in accordance with the ambient temperature change after stopping the engine falls below the predetermined pressure, it is determined that the purge valve is open and fixed, The degree of fixation of the purge valve is determined based on the amount of change in the outside air temperature after engine startup and the connection position of the fuel pressure switch and the connection position of the fuel pressure switch, It is possible to reduce the fixing diagnosis time of the purge valve to a minimum and improve the reliability of the fuel leak diagnosis result since the fuel leak diagnosis is executed after the determination of the fixing of the purge valve is executed.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

When the fuel pressure switch is connected in the ON state as the fuel pressure which decreases in accordance with the ambient temperature change after the engine stop is decreased to a predetermined value or less, it is determined that the purge valve is open and fixed. When the fuel pressure switch is not connected in the ON state, The open / close fixation of the purge valve is determined based on the fuel pressure which is reduced after formation with the natural negative pressure, and the purge valve is closed based on the change in the ambient air temperature and the connection position of the fuel pressure switch and the connection position of the fuel pressure switch, And the reliability of the fuel leak diagnosis result can be improved because the fuel leakage diagnosis is executed after the determination of the fixing of the purge valve is performed. , And can make very great advances in terms of performance efficiency, It is not only a possibility of commercialization or sales of the vehicle, but also a possibility that it can be practically and practically carried out, so that it is an invention that is industrially applicable.

Claims (11)

a) receiving a connection position of a fuel pressure switch connected to the on-state at a time point at which the fuel pressure in the fuel tank falls to a preset predetermined value;
b) when the connection position of the fuel pressure switch is on, determining that the purge valve is open and fixed;
c) if the connection position of the fuel pressure switch is not connected in an ON state, receiving outdoor air temperature after engine startup, deriving an ambient air temperature variation during engine stop, and storing the outdoor air temperature change;
d) counting a timer after starting the engine and terminating counting of the timer when the connection position of the fuel pressure switch is received in an ON state, and deriving a connection time of the fuel pressure switch after starting the engine;
e) determining whether the engine has stabilized after starting the engine, and deriving a determination reference time based on the fuel level, the intake air amount, and the ambient temperature change amount when the engine is stabilized; And
f) comparing the connection time of the fuel pressure switch with a criterion reference time, and determining a degree of opening and closing of the purge valve according to a result of the comparison. delete 2. The method of claim 1,
f-1) determining that the degree of opening of the purge valve is fixed as a small-scale open fixation when the connection time of the fuel pressure switch exceeds the determination reference time; And
f-2) judging the extent of the degree of fixation of the purge valve open to be a large-scale open fixation when the connection time of the fuel pressure switch does not exceed the determination reference time. The method of claim 1,
g) if the fuel pressure switch is not connected in the on state, the counting value of the timer is received; and if the count value of the timer exceeds a predetermined time, the purge valve is not fixed Further comprising the step of determining whether the purge valve is open or closed. 5. The method of claim 4,
h) If the count value of the timer received in the step g) does not exceed the preset predetermined time, it is determined whether the ambient temperature change amount of the step c) is within the predetermined threshold range, And determining that the purge valve fixing diagnosis is not possible if the purge valve is not within the predetermined range. A fuel pressure switch for outputting a connection position of the fuel pressure switch in the ON state when the fuel pressure of the fuel tank reaches a predetermined pressure; And
And a diagnosis control section for judging that the purge valve is open and fixed when the connection position of the fuel pressure switch is on when the natural negative pressure is formed on the fuel pressure of the fuel tank which is lowered according to the ambient temperature after the engine is stopped,
Wherein the diagnosis control unit comprises:
The outdoor air temperature change amount is derived and stored by receiving the outdoor air temperature before and after the start of the engine,
The counting of the timer is started after the engine is started, the counting of the timer is ended when the connection position of the fuel pressure switch is on, and the connection time of the fuel pressure switch is derived,
The determination time is derived based on the fuel level, the intake air amount, and the ambient temperature change amount supplied from the outside when the engine is stabilized,
And comparing the connection time of the fuel pressure switch with the determination reference time to determine the degree of fixation of the purge valve opening based on the comparison result. A fuel pressure switch for outputting a connection position of the fuel pressure switch in the ON state when the fuel pressure of the fuel tank reaches a predetermined pressure;
A diagnosis control unit for determining that the purge valve is open when the natural pressure is formed in the fuel pressure of the fuel tank which is lowered according to the ambient temperature after the engine is stopped,
A timer for starting counting after stopping the engine, determining the fuel pressure of the fuel tank to a predetermined pressure, terminating the counting upon reception of the connection position of the fuel pressure switch in the ON state, and deriving the connection time of the fuel pressure switch; And
And an outside air temperature sensor for receiving outside air temperature after engine stop and outside air temperature after engine starting to derive an outside air temperature change amount during engine stop,
Wherein the diagnosis control unit comprises:
And the degree of fixation of the purge valve opening is determined based on the connection time of the fuel pressure switch received after engine startup and the amount of change in the ambient temperature. delete 7. The method of claim 6, wherein the purge valve opening degree of engagement
When the connection time of the fuel pressure switch exceeds the determination reference time, it is determined that the small purge valve is open and fixed,
And when the connection time of the fuel pressure switch does not exceed the determination reference time, it is determined that the large-scale purge valve is open and fixed. 7. The apparatus of claim 6,
And when it is determined that the connection time of the fuel pressure switch has exceeded a predetermined time, it is determined that the purge valve is not open and fixed. 11. The apparatus of claim 10,
When the connection time of the fuel pressure switch does not exceed the predetermined time and the ambient temperature change amount does not fall within the predetermined threshold range, the purge valve diagnosis diagnosis is made to be impossible. .
KR1020120095267A 2012-08-29 2012-08-29 Method and apparatus for diagnosing purge valve of vehicle KR101913220B1 (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100756861B1 (en) * 2006-10-31 2007-09-07 지멘스 오토모티브 주식회사 Method for diagonsing full open stuck of canister purge valve
KR100858620B1 (en) * 2007-04-09 2008-09-17 콘티넨탈 오토모티브 시스템 주식회사 Method for diagnosing leakage on evaporative gas system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100756861B1 (en) * 2006-10-31 2007-09-07 지멘스 오토모티브 주식회사 Method for diagonsing full open stuck of canister purge valve
KR100858620B1 (en) * 2007-04-09 2008-09-17 콘티넨탈 오토모티브 시스템 주식회사 Method for diagnosing leakage on evaporative gas system

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