JP2007205210A - Abnormality detection device for evaporated fuel treatment device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an abnormality detection device capable of inhibiting discharge of evaporated fuel to an outside caused by detection of system abnormality in an evaporated fuel treatment device capable of sealing a fuel tank. <P>SOLUTION: The abnormality detection device for the evaporated fuel treatment device is provided with a fuel tank 10, a canister 20 adsorbing evaporated fuel and purging adsorbed evaporated fuel to an intake air passage of an engine, a sealed control valve 30 capable of keeping the fuel tank 10 under a sealed condition, a purge valve 50 opening and closing the purge passage, and the like. ECU 150 constructing the abnormality detection device detects a normal condition of the device based on pressure in a device during operation of the engine, and does not execute process of abnormality detection with air (gas) in the device discharged by a pump module 60 after engine stop if the device is normal. Consequently, discharge of evaporated fuel to the outside during system abnormality detection can be inhibited. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an abnormality detection apparatus for an evaporative fuel processing apparatus that suppresses the emission of evaporative fuel from a fuel tank to the atmosphere.

In order to prevent the evaporated fuel from being discharged into the atmosphere from the fuel tank, the evaporated fuel from the tank is led to a canister containing an adsorbent such as activated carbon, and the evaporated fuel is adsorbed to the adsorbent to release the fuel vapor to the atmosphere. An evaporative fuel processing apparatus for preventing the above is generally known.
In addition, in order to suppress the leakage of evaporated fuel to the outside more reliably, not only a canister but also an evaporated fuel processing apparatus that can provide a sealing control valve to seal the fuel tank while the engine is stopped (for example, , See Patent Document 1).
In the above evaporative fuel processing equipment, if the equipment malfunctions, especially leakage to the canister, fuel tank, etc., failure such as perforation occurs and the airtightness cannot be maintained, the evaporative fuel is not supplied to the internal combustion engine but released to the atmosphere. Will cause air pollution. For this reason, it is necessary to detect a failure. In particular, in a system in which a fuel tank is sealed with a sealed control valve while the engine is stopped, not only a failure such as a leakage of the fuel tank but also a failure detection of the sealed control valve is important. This is because the purge control cannot be performed if a closed sticking failure occurs in which the hermetic control valve remains closed, and the evaporated fuel may leak to the outside if an open sticking failure occurs that remains open.
JP 2003-97362 A

By the way, in the past, for example, when the engine is stopped (when the ignition switch is turned off), the air in the system is exhausted to the outside (atmosphere side) using an air pump, thereby forcing the pressure in the system. The pressure inside the system, including the pressure inside the fuel tank, is detected and the leakage of the system such as the fuel tank, canister, etc. is detected based on the detected value and the sealing control valve is opened and closed. An abnormality is detected.
However, in this abnormality detection method, it is necessary to open the hermetic control valve after the engine is stopped and exhaust the air (gas) in the system to the outside (atmosphere side) by a pump to make it a negative pressure. Depending on the state of the canister provided in (e.g., a saturated state, a failure state), the evaporated fuel may be discharged to the outside.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an evaporative fuel treatment apparatus capable of sealing a fuel tank to detect an evaporative fuel generated for detecting an abnormality in the evaporative fuel treatment apparatus. An object of the present invention is to provide an abnormality detection device capable of suppressing discharge to the outside.

An abnormality detection apparatus for an evaporated fuel processing apparatus according to a first aspect of the present invention is connected to a fuel tank for storing fuel, a fuel tank and a vapor passage, and connected to an intake passage of an engine via a purge passage. An evaporative fuel processing apparatus comprising: a canister for detecting an abnormality in an evaporative fuel processing apparatus based on a pressure in the evaporative fuel processing apparatus when the air in the evaporative fuel processing apparatus is exhausted to the outside by a pump The evaporative fuel processing apparatus is in a normal state based on an abnormality detection means for performing an abnormality detection process for detecting that the evaporative fuel is in an abnormal state and the pressure in the evaporative fuel processing apparatus when the internal combustion engine is being driven. Normality detecting means for detecting, and the abnormality detecting means does not perform abnormality detection processing when it is determined that the normality detecting means is in a normal state.
According to this configuration, when the evaporative fuel processing apparatus is determined to be in the normal state by the normality detecting means based on the tank internal pressure, the abnormality detecting process is not executed by the abnormality detecting means. The inside air is not exhausted by the pump, and the discharge of the evaporated fuel to the outside can be suppressed.

  An abnormality detection apparatus for a fuel vapor processing apparatus according to a second aspect of the present invention is connected to a fuel tank for storing fuel, a fuel tank and a vapor passage, and connected to an intake passage of an engine via a purge passage. An abnormality detecting device in an evaporative fuel processing apparatus comprising a canister that is sealed and a block valve that can block a vapor passage, and pumps air in the evaporative fuel processing apparatus when the block valve is controlled to be in a sealed state An abnormality detection means for performing an abnormality detection process for detecting an abnormal state in which the sealing valve is fixed in an unblocked state based on the pressure in the evaporative fuel processing apparatus when exhausted to the outside, and the internal combustion engine is driven And a normal detection means for detecting that the blocking valve functions normally in the blocking state based on the pressure in the fuel tank when the blocking valve is controlled to be in the blocking state. Detecting hand Is, if it is determined to be normal state by normal detection means does not perform the abnormality detection processing, it is characterized in that.

  In the above configuration, the normality detecting means is configured such that the blocking valve is based on the pressure in the fuel tank and the pressure outside the fuel tank when the internal combustion engine is being driven and the blocking valve is controlled to be in the blocking state. A configuration that detects normal functioning in the blocked state can be employed.

  An abnormality detection apparatus for an evaporative fuel processing apparatus according to a third aspect of the present invention is connected to a fuel tank for storing fuel, a fuel tank and a vapor passage, and connected to an intake passage of an engine via a purge passage. An abnormality detection device in an evaporative fuel processing apparatus comprising a canister that is sealed and a block valve that can block a vapor passage, and pumps air in the evaporative fuel processing apparatus when the block valve is controlled to be in a sealed state An abnormality detection means for performing an abnormality detection process for detecting that the tank is in an abnormal state in a leak state based on the pressure in the evaporated fuel processing device when exhausted to the outside, and the internal combustion engine is being driven, and Normal detection means for detecting that the fuel tank is in a normal state that is not in a leak state based on the pressure in the fuel tank when the block valve is controlled to be in the closed state. Is, if it is determined to be normal state by normal detection means is characterized not to perform the abnormality detection processing.

  In the above configuration, the normality detecting means is based on the pressure in the fuel tank when the internal combustion engine is being driven and the blocking valve is controlled to be in the blocking state, and the pressure outside the fuel tank. It is possible to adopt a configuration for detecting that the normal state is not the leak state.

  An abnormality detection apparatus for an evaporative fuel processing apparatus according to a fourth aspect of the present invention is connected to a fuel tank for storing fuel, a fuel tank and a vapor passage, and connected to an intake passage of an engine via a purge passage. An abnormality detecting device in an evaporative fuel processing apparatus comprising a canister that is sealed and a block valve that can block a vapor passage, and pumps air in the evaporative fuel processing apparatus when the block valve is controlled to be in a sealed state And an abnormality detection means for performing an abnormality detection process for detecting that the sealing valve is in an abnormal state in which the sealing valve is stuck in a blocked state based on the pressure in the evaporated fuel processing device when exhausted to the outside, and the internal combustion engine is being driven And a normal detection means for detecting that the blocking valve functions normally in the non-blocking state, based on the pressure in the fuel tank when the blocking valve is controlled to the non-blocking state, Anomaly detection Stage does not perform abnormality detection processing if it is determined to be normal by the normal detection means is characterized by.

  In the above configuration, the normality detection means is configured to detect the pressure in the fuel tank and the non-blocking state when the blocking valve is controlled to be in a blocking state in a state in which the purge valve provided in the purge passage is opened during driving of the internal combustion engine. Based on the pressure in the fuel tank during the control, it is possible to adopt a configuration that detects that the blocking valve functions normally in the non-blocking state.

  ADVANTAGE OF THE INVENTION According to this invention, discharge | emission to the exterior of the evaporative fuel which arises for abnormality detection in an evaporative fuel processing apparatus can be suppressed.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, exemplary embodiments of the invention will be described with reference to the accompanying drawings.
FIG. 1 is a configuration diagram of a fuel vapor processing apparatus according to an embodiment of the present invention.
The evaporative fuel processing apparatus includes a fuel tank 10, a canister 20, and a sealing control valve 30 that opens and closes a vapor passage 70 that communicates between the fuel tank 10 and the canister 20 (the sealing control valve 30 seals the vapor passage 10 to close the fuel tank 10). Or the canister 20 may be hermetically sealed and may be referred to as a sealing valve), a purge valve 50 that opens and closes a purge passage 40 that communicates the canister 20 and an intake passage 100 of an engine (not shown), the canister 20 and the atmosphere. , A pressure sensor 80 for detecting the pressure in the fuel tank 10, a detection signal of the pressure sensor 80 is input, and the sealing control valve 30, the purge valve 50, the pump module 60, and the like are controlled. Control device for internal combustion engine (hereinafter referred to as ECU (Electronic Control Unit)) 150 It is constructed from.

  In FIG. 1, the intake passage 100 communicates with a cylinder of an internal combustion engine (not shown). The throttle valve 110 provided on the upstream side of the intake passage 100 is controlled by the ECU 150 to adjust the amount of air flowing into the cylinder.

  The fuel tank 10 is supplied with fuel F such as gasoline from the fuel filler port 15 and stores it inside.

  The canister 20 is provided with an adsorbing material such as activated carbon in the inside thereof. The adsorbing material adsorbs the evaporated fuel of the fuel F generated in the fuel tank 10 supplied through the vapor passage 70 and purges the adsorbed evaporated fuel. Purge to the intake passage 100 of the engine through the passage 40.

The sealing control valve 30 is provided in the middle of the vapor passage 70, and opens and closes the vapor passage 70 by driving the valve body 31 with a solenoid or the like, and closes the vapor passage 70 to seal the inside of the fuel tank 10. To. The hermetic control valve 30 is controlled by the ECU 150 and serves to reliably prevent the evaporated fuel from being discharged from the fuel tank 10 to the outside while the engine is stopped.
The purge valve 50 is controlled by the ECU 150 to control the purge amount of the evaporated fuel into the intake passage 100 and adjusts the opening degree of the purge passage 40.

The pump module 60 is controlled by the ECU 150 and changes the internal pressure of the evaporated fuel processing device to a negative pressure when detecting abnormality of the evaporated fuel processing device for leakage.
Here, the structure and operation of the pump module 60 will be described with reference to FIGS.
FIG. 2 is a schematic diagram showing the structure of the pump module 60, FIG. 3 is a diagram showing the operation of the pump module 60 in a normal state, and FIG. 4 is a diagram showing the operation of the pump module 60 when an abnormality is detected.

  As shown in FIG. 2, the pump module 60 includes a pressure sensor 61, a pump 62, a switching valve 63, a solenoid 64, a pipe L1 that communicates with the canister 20, a pipe L2 that communicates the pipe L1 and the pump 62, the atmosphere It comprises a pipe L3 communicating with the side, a reference orifice 65 provided in the pipe L2, a check valve 66, and the like. Pressure sensor

The switching valve 63 includes two passages 63A and 63B, and is driven by the solenoid 64 to switch the connection state between the pipes L1 to L3 as described later.
The solenoid 64 is driven by the ECU 150 to move the switching valve 63 between the normal position and the abnormality detection position.
The pump 62 exhausts air (gas) on the pipe L2 side to the pipe L3 side (atmosphere side).
The reference orifice 65 is formed in the middle of the pipe line L2, and has a diameter of about 0.5 mm, for example.

  The pressure sensor 61 is provided between the pump 62 and the reference orifice 65 in the pipe L2, detects the pressure between the pump 62 and the reference orifice 65, and outputs it to the ECU 150.

  As shown in FIG. 3, the pump module 60 having the above-described configuration is maintained in a state where the passage 63A of the switching valve 63 communicates between the pipe line L1 and the pipe line L3 (hereinafter, this position is referred to as “position”). Normal side). When the pump 62 is driven while the switching valve 63 is on the normal side, the air FL flows into the passage 63A and the pipe L2 from the atmosphere side, passes through the reference orifice 65, and is discharged to the atmosphere side by the pump 62. The pressure detected by the pressure sensor 61 at this time is set as a reference pressure when abnormality is detected.

When the abnormality is detected, the pump module 60 is in a state where the passage 63B of the switching valve 63 communicates with the pipe line L1 and the pipe line L1 is directly connected to the pump 62, as shown in FIG. This position is the abnormality detection side).
When the pump 62 is driven in a state where the switching valve 63 is on the abnormality detection side, the air (gas) on the canister 20 side is discharged to the atmosphere side. That is, when the pump module 60 is operated with the sealing control valve 30 and the purge valve 50 closed, air (gas) is discharged from the fuel tank 10 and the canister 20 to the atmosphere, and the fuel tank 10 and the canister 20 are depressurized. It becomes negative pressure.

The ECU 150 is basically composed of hardware such as a processor, a memory, and necessary software, and based on detection signals of various sensors (not shown) provided in the internal combustion engine, ignition control, fuel injection amount control, purge control Etc. to control the internal combustion engine comprehensively.
Further, the ECU 150 controls the evaporated fuel processing device and constitutes an abnormality detection device for the evaporated fuel processing device, and the evaporated fuel processing device is normal based on the pressure in the fuel tank 10 detected after the engine is started. When it is determined that the evaporative fuel treatment device is normal, the air in the evaporative fuel treatment device is exhausted to the atmosphere by the pump module 60 when the engine is stopped. Based on the detected pressure value at that time, it is detected whether there is any abnormality in the evaporated fuel processing apparatus. The abnormality detection process will be described later.

Next, an example of abnormality detection processing during engine driving by the ECU 150 will be described with reference to the flowchart shown in FIG. The process shown in FIG. 5 is executed while the engine is being driven.
As shown in FIG. 5, the ECU 150 first determines whether or not the pressure sensor 80 that detects the pressure (internal pressure) of the fuel tank 10 is normal (step ST1), and whether or not the pressure sensor 61 provided in the pump module 60 is normal. Is detected (step ST2). Whether or not these pressure sensors 80 and 61 are normal may be determined based on, for example, various parameters detected after the ignition switch is turned on, or normal / abnormal is determined before the ignition switch is turned on. You may judge based on a result.

Next, the sealing control valve 30 and the purge valve 50 are closed and the position of the switching valve is set to the normal side (step ST3).
Next, it is determined whether or not the integrated value of the intake air amount is equal to or greater than a predetermined value (step ST4). This determination only needs to be a condition that allows the internal pressure of the fuel tank 10 to be determined to have increased by driving the engine, such as determining whether a predetermined time has elapsed since the engine start.

  Next, the internal pressure P1 (detected value of the pressure sensor 80) of the fuel tank 10 is detected (step ST5), and the internal pressure P2 (detected value of the pressure sensor 61) of the pump module 60 is detected (step ST6). The internal pressure P2 is equal to the atmospheric pressure because the position of the switching valve 63 is on the normal side.

Next, ECU 150 determines whether or not the absolute value of the difference between internal pressure P1 and internal pressure P2 is equal to or greater than a predetermined value (step ST7).
If this difference is smaller than a predetermined value, it is determined that the fuel tank 10 is normal and there is no leak, and the sealing control valve 30 is also determined to be normally closed (open stuck normally) (step ST8). Then, if a key OFF processing flag, which will be described later, is turned on, it is turned off (step ST9), and the processing is terminated.

On the other hand, if the absolute value of the difference between the internal pressure P1 and the internal pressure P2 is greater than or equal to a predetermined value in step ST7, it is determined that there is an abnormality and the key-off processing flag is turned on (step ST10). The key OFF flag is a flag that determines whether or not to perform abnormality detection processing when the ignition switch is turned off and the engine is stopped.
In step ST7, the case where the atmospheric pressure P2 is detected by the pressure sensor 61 of the pump module 60 and the tank internal pressure P1 is compared with the atmospheric pressure P2 to determine the normality has been described. However, switching is performed instead of using the atmospheric pressure. Other pressure values (pressure values that do not change like the tank internal pressure P1 after the engine start), such as a configuration in which the internal pressure of the canister 20 and the tank internal pressure P1 are compared when the valve 63 is moved to the abnormality detection side, are used. It may be used.

Next, an example of the abnormality detection process when the engine is stopped (when the key is OFF) by the ECU 150 will be described with reference to the flowchart shown in FIG.
The process shown in FIG. 6 is performed when the abnormality detection process before the engine is stopped (the key is turned off) and the key OFF processing flag is turned on, and the leakage abnormality of the fuel tank 10 and the sealing control valve 30 are performed. The detection process of the open sticking abnormality is executed.

ECU 150 determines whether or not the above-described key-off processing flag is turned on (step ST11). If the key-off processing flag is off, other abnormality detection processing is executed (step ST13), and key off is performed. When the hour processing flag is ON, the detection process for the leakage abnormality of the fuel tank 10 and the detection process for the open adhesion abnormality of the sealing control valve 30 are executed (step ST12). In this abnormality detection process, the pump 62 is driven in a state where the position of the switching valve 63 in the pump module 60 is set to the abnormality detection side, thereby forcibly bringing the fuel tank 10 and the canister 20 into a negative pressure state. Is included.
In the other abnormality detection process, the process for driving the pump 62 as described above is basically not performed (the pump 62 may be driven depending on the degree of abnormality).

  As described above, according to the present embodiment, it is detected that the sealing control valve 30 and the fuel tank 10 constituting the evaporated fuel processing device are normal based on the pressure change in the fuel tank 10 that occurs after the engine is started. Therefore, if it can be determined that it is normal at this time, it is not necessary to execute processing for detecting an abnormality in the sealing control valve 30 and the fuel tank 10 when the ignition key is turned off. As a result, it is not necessary to drive the pump 62 of the pump module 60 to forcibly set the negative pressure in the system, and it is possible to suppress the discharge of the evaporated fuel accompanying the abnormality detection process.

Next, another example of the abnormality detection process in the ECU 150 will be described with reference to the flowcharts shown in FIGS. 7 and 8 and the timing chart shown in FIG.
The process shown in FIG. 7 is executed while the engine is being driven, and the process shown in FIG. 8 is executed when the engine is stopped.
The ECU 150 first determines whether or not the pressure sensor 80 that detects the pressure (internal pressure) of the fuel tank 10 is normal (step ST21), and detects whether or not the pressure sensor 61 provided in the pump module 60 is normal (step ST22). . This detection method is the same as described above.
Next, the sealing control valve 30 and the purge valve 50 are closed, and the position of the switching valve 63 is set to the normal side (step ST23).

Next, with the sealing control valve 30 and the purge valve 50 closed, the internal pressure P3 of the fuel tank 10 is detected (step ST24), and the internal pressure P4 of the pump module 60 is detected (step ST25).
Next, ECU 150 determines whether the absolute value of the difference between internal pressure P3 and internal pressure P4 is equal to or greater than a predetermined value (step ST26).
If this difference is smaller than the predetermined value, the process is terminated. When detecting the internal pressure P3 and the internal pressure P4, the sealing control valve 30 may be in an open state, or the switching valve 63 may be on the abnormality detection side.

  In step ST26, if the absolute value of the difference between the internal pressure P3 and the internal pressure P4 is equal to or greater than a predetermined value, it is determined whether the purge control execution condition is satisfied (step ST27). This condition determination is performed based on, for example, whether the difference between the internal pressure of the fuel tank 10 and the atmospheric pressure is equal to or greater than a predetermined value.

Next, the sealing control valve 30 and the purge valve 50 are opened, and the position of the switching valve 63 is set to the normal side (step ST28). The position of the switching valve 63 may be on the abnormality detection side.
At this time, when the purge valve 50 is opened from the closed state, the evaporated fuel existing in the purge passage 40 and the like is guided to the intake passage 100 and combusts, so that the pressure in the system decreases as shown in FIG.
When the sealing control valve 30 is opened, in order to prevent the canister 20 from being blown through, as shown in FIG. 9, after opening the purge valve 50, the sealing control valve 30 is opened and closed intermittently at a predetermined cycle. . The blow-through of the canister 20 means that the hermetic control valve 30 is opened for a long time in a state where the pressure in the fuel tank 10 is high such as a positive pressure state (a state where the pressure in the fuel tank 10 is higher than the atmospheric pressure). That is, the air in the fuel tank 10 is released to the atmosphere side through the canister 20 instead of the intake passage.

Next, the internal pressure P5 of the fuel tank 10 is detected (step ST29).
Then, it is determined whether the absolute value of the difference between the internal pressure P3 and the internal pressure P5 is equal to or greater than a predetermined value (step ST30).
Here, if the sealing control valve 30 is normally opened and closed, the pressure in the fuel tank 10 decreases as the sealing control valve 30 is opened, but the sealing control valve 30 remains closed. In the state of sticking abnormality, the pressure in the fuel tank 10 does not decrease even after the opening control of the sealing control valve 30 is started. Therefore, when the absolute value of the difference between the internal pressure P3 and the internal pressure P5 is smaller than a predetermined value, It is determined that there is an abnormality, and the above-mentioned key OFF processing flag is turned on (step ST33).
On the other hand, if the absolute value of the difference between the internal pressure P3 and the internal pressure P5 is greater than or equal to a predetermined value, it is determined that the sealing control valve 30 is also normally open (normally closed and closed) (step ST31), and the key OFF processing flag is turned on. If it is, it is turned off (step ST32), and the process is terminated.

  When the key is OFF, as shown in FIG. 8, ECU 150 determines whether or not the key OFF processing flag is ON in the abnormality detection process before stopping the engine (the key is turned OFF) (step ST41). If not, other abnormality detection processing is executed as described above (step ST43). If the key OFF time processing flag is ON, a detection process of a closed sticking abnormality of the sealing control valve 30 is executed (step ST42). In this abnormality detection process, the pump 62 is driven in a state where the position of the switching valve 63 in the pump module 60 is set to the abnormality detection side, thereby forcibly bringing the fuel tank 10 and the canister 20 into a negative pressure state. Is included.

  As described above, according to the present embodiment, it is possible to determine whether the sealing control valve 30 is normal by opening the sealing control valve 30 after the start of the purge control and causing a pressure change in the fuel tank 10. If it can be determined that it is normal at this time, it is not necessary to execute processing for detecting an abnormality of the hermetic control valve 30 when the ignition switch is turned off (key OFF). As a result, it is not necessary to drive the pump module 60 to forcibly set the negative pressure in the system, and it is possible to suppress the discharge of the evaporated fuel accompanying the abnormality detection process.

  In the above embodiment, in order to prevent the canister 20 from being blown through, the configuration in which the sealing control valve 30 is intermittently opened / closed at a predetermined cycle has been described. As shown, the opening / closing cycle (duty) of the sealing control valve 30 may be controlled. Specifically, immediately after the opening and closing of the sealing control valve 30 is started, the duty (opening / closing cycle) is made relatively short, then gradually increased, and finally the normal opening / closing cycle is set.

  In order to further improve the detection accuracy in the abnormality detection process in FIG. 10, for example, as shown in FIG. 11, when the internal pressure of the fuel tank 10 decreases and the canister 20 reaches a pressure at which the canister 20 does not blow through, the sealing control is performed. The normal opening / closing cycle T1 of the valve 30 is further extended to be an opening / closing cycle T2. This makes it possible to detect a stable pressure during the opening / closing cycle T2.

  In the above embodiment, in order to determine whether the fuel tank 10 and the sealing control valve 30 are normal, it is determined whether the pressure difference between the pressure in the fuel tank 10 and the atmospheric pressure is a predetermined value or more only once. Although explained, it is not necessarily limited to this. From the appraisal that increases the determination accuracy, for example, it is determined that the determination is normal only when the determination is made a plurality of times and the condition is continuously satisfied, the determination is made a plurality of times and the condition is Various modifications can be made to the determination method, such as determining normality based on the proportion of established times.

  In the above-described embodiment, the case where an abnormality is detected by forcibly reducing the pressure in the system when the engine is stopped has been described. However, the present invention is not limited to this, and the ECU 150 is activated while the engine is stopped. It is also possible to perform abnormality detection.

  In the above embodiment, the case where the abnormality detection device is configured by the ECU 150 has been described. However, the present invention is not limited to this, and the abnormality detection device may be configured separately from the engine control device.

It is a block diagram of the evaporative fuel processing apparatus which concerns on one Embodiment of this invention. It is the schematic which shows the structure of a pump module. It is a figure which shows operation | movement of the pump module at the normal time. It is a figure which shows operation | movement of the pump module at the time of abnormality detection. It is a flowchart which shows an example of the abnormality detection process at the time of an engine drive. It is a flowchart which shows an example of the abnormality detection process at the time of an engine stop (at the time of key OFF). It is a flowchart which shows the other example of the abnormality detection process at the time of an engine drive. It is a flowchart which shows the other example of the abnormality detection process at the time of an engine stop (at the time of key OFF). 8 is a timing chart showing various states in the process of FIG. It is another timing chart which shows the various states in an abnormality detection process. It is another timing chart which shows the various states in an abnormality detection process.

Explanation of symbols

10 ... Fuel tank 20 ... Canister 30 ... Sealing control valve (blocking valve)
40 ... Purge passage 50 ... Purge valve 60 ... Pump module 61 ... In-system pressure sensor 70 ... Vapor passage 80 ... Pressure sensor 100 ... Intake passage 110 ... Throttle valve 150 ... ECU (abnormality detection device)

Claims (7)

An abnormality detection device in an evaporative fuel processing apparatus, comprising: a fuel tank that stores fuel; and a canister that is connected to the fuel tank via a vapor passage and is connected to an intake passage of the engine via a purge passage. ,
An abnormality detection means for performing an abnormality detection process for detecting that the evaporated fuel processing device is in an abnormal state based on the pressure in the evaporated fuel processing device when the air in the evaporated fuel processing device is exhausted to the outside by a pump;
Normal detection means for detecting that the evaporated fuel processing apparatus is in a normal state based on the pressure in the evaporated fuel processing apparatus when the internal combustion engine is being driven,
The abnormality detection device for an evaporated fuel processing apparatus, wherein the abnormality detection unit does not perform the abnormality detection process when the normality detection unit determines that the abnormality is normal. A fuel tank for storing fuel; a canister connected to the fuel tank via a vapor passage and connected to an intake passage of the engine via a purge passage; and a sealing valve capable of sealing the vapor passage. An abnormality detection device in an evaporative fuel processing device,
Based on the pressure in the evaporated fuel processing apparatus when the air in the evaporated fuel processing apparatus is exhausted to the outside by a pump when the blocking valve is controlled to be in the sealed state, the blocking valve is fixed in an unblocked state. An abnormality detection means for performing an abnormality detection process for detecting an abnormal state,
Normal detection for detecting that the block valve functions normally in the blocked state based on the pressure in the fuel tank when the internal combustion engine is being driven and the block valve is controlled to the blocked state Means, and
The abnormality detection device for an evaporated fuel processing apparatus, wherein the abnormality detection unit does not perform the abnormality detection process when the normality detection unit determines that the abnormality is normal. The normality detecting means is based on the pressure in the fuel tank and the pressure outside the fuel tank when the internal combustion engine is being driven and the sealing valve is controlled to be in a sealed state. 3. The abnormality detection device for an evaporated fuel processing device according to claim 2, wherein the device detects that it functions normally in a blocked state. A fuel tank for storing fuel; a canister connected to the fuel tank via a vapor passage and connected to an intake passage of the engine via a purge passage; and a sealing valve capable of sealing the vapor passage. An abnormality detection device in an evaporative fuel processing device,
Based on the pressure in the evaporative fuel processing device when the air in the evaporative fuel processing device is exhausted to the outside by a pump when the blockade valve is controlled to be in a sealed state, the tank is in an abnormal state in a leak state An anomaly detection means for performing an anomaly detection process to detect that there is,
Normal detection means for detecting that the fuel tank is in a normal state that is not in a leak state based on the pressure in the fuel tank when the internal combustion engine is being driven and the block valve is controlled to be in a closed state And comprising
The abnormality detection device for an evaporated fuel processing apparatus, wherein the abnormality detection unit does not perform the abnormality detection process when the normality detection unit determines that the abnormality is normal. The normality detection means is based on the pressure in the fuel tank and the pressure outside the fuel tank when the internal combustion engine is being driven and the blocking valve is controlled to be in a blocking state. 5. The abnormality detection apparatus for an evaporated fuel processing apparatus according to claim 4, wherein the apparatus detects that the fuel is in a normal state other than a leak state. A fuel tank for storing fuel; a canister connected to the fuel tank via a vapor passage and connected to an intake passage of the engine via a purge passage; and a sealing valve capable of sealing the vapor passage. An abnormality detection device in an evaporative fuel processing device,
Based on the pressure in the evaporated fuel processing apparatus when the air in the evaporated fuel processing apparatus is exhausted to the outside by a pump when the blocking valve is controlled to be in the blocked state, the blocking valve is fixed in the blocked state. An abnormality detection means for performing an abnormality detection process for detecting an abnormal state;
Based on the pressure in the fuel tank when the internal combustion engine is in operation and the sealing valve is controlled to the non-blocking state, it is detected that the sealing valve functions normally in the non-blocking state. A normal detection means,
The abnormality detection device for an evaporated fuel processing apparatus, wherein the abnormality detection means does not perform the abnormality detection processing when it is determined that the abnormality detection means is normal. The normality detection means is configured so that the pressure in the fuel tank and the non-blocking state when the blocking valve is controlled to be in a blocking state in a state in which the purge valve provided in the purge passage is opened while the internal combustion engine is being driven. The evaporation according to claim 6, wherein it detects that the blocking valve functions normally in an unblocked state on the basis of the pressure in the fuel tank when the control is performed. An abnormality detection device for a fuel processing device.

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