JP5690156B2 - Evaporative fuel processing equipment - Google Patents

Description

  The present invention relates to an evaporated fuel processing apparatus that includes a canister that adsorbs evaporated fuel generated in a fuel tank and processes the evaporated fuel.

  In the conventional evaporative fuel treatment system, the evaporative fuel generated in the fuel tank is prevented from being released into the atmosphere during refueling, and the evaporative fuel is adsorbed to the canister to reduce the pressure in the fuel tank. (For example, refer to Patent Document 1). This fuel vapor processing apparatus is configured such that when fuel is supplied to a fuel tank, a lid provided on the vehicle body is opened by a rider of the vehicle operating a lid switch provided in the vehicle.

  In the conventional evaporative fuel processing apparatus, even when the ignition switch is OFF, when the lid switch is operated, the ECU is activated, and a control valve provided in a vapor passage communicating the fuel tank and the canister To open the pressure of the fuel tank. Here, when an abnormality such as a failure has occurred in the lid switch, the pressure cannot be released without starting the ECU. Therefore, in the conventional fuel vapor processing apparatus, it is determined that an abnormality has occurred in the lid switch when the operation of refueling is detected without detecting the operation of the lid switch. That is, in the conventional fuel vapor processing apparatus, an operation history of the lid switch is created, and abnormality determination of the lid switch is performed using the operation history (see FIG. 5 of Patent Document 1).

JP 2004-156497 A

  However, since the lid switch is a switch that may be erroneously operated, that is, a switch that may be operated other than refueling, it is desired to determine the abnormality of the lid switch regardless of the operation history of the lid switch. .

  Therefore, an object of the present invention is to provide an evaporated fuel processing apparatus that can improve the accuracy of lid switch abnormality determination.

The present invention was devised to solve the above-described problems, and is an evaporative fuel processing apparatus for a vehicle, which is a fuel tank that stores fuel, a canister that adsorbs evaporative fuel generated in the fuel tank, A filler pipe that is communicated with the fuel tank and into which fuel is introduced from an opening during refueling; a fuel lid that is provided on a vehicle body and covers the opening; and a lid switch that outputs an opening command for opening the fuel lid; Fuel amount detection means for detecting the amount of the fuel in the fuel tank, and control means that starts when the ignition switch of the vehicle is on and stops when the ignition switch is off, the control means comprising: the amount of the when the ignition switch is turned off, the fuel detected by the fuel quantity detecting means at that time Together in the storage means, to stop the effect that has not been increased determination of the amount of the fuel after storing in the storage means, then, the ignition switch is the opening command from the lid switch in the OFF The storage means is activated when it is output and when the ignition switch detected by the fuel amount detection means is turned off and the increase in the amount of fuel is being determined. is stored in the further the acquired amount of the fuel detected by the fuel quantity detecting means when the ignition switch is turned on, the ignition switch is the determination of the increase in the amount of the fuel in off the the amount of the fuel when the amount of the fuel to not stored in the storage means the ignition switch is turned off Base if you are increased by more than a predetermined amount, abnormality in the lid switch and determines that has occurred.

In the present invention, the abnormality of the lid switch is a concept including the following four states, for example.
(1) Since a failure occurred in the lid switch and an open command could not be output, the driver etc. manually opened the fuel lid and refueled.
(2) Since the wiring for connecting the lid switch and the control means so as to be communicable is broken and the opening command is not input to the control means, the driver or the like manually opens the fuel lid and supplies fuel.
(3) Although the ECU 2 has acquired the opening command but cannot be activated, the driver or the like manually opened the fuel lid and refueled.
(4) Although no failure occurred in the lid switch etc., the driver etc. manually opened the fuel lid 8 and refueled.

In the present invention, “no determination of increase in fuel amount” means “when the determination of increase in fuel amount itself is not performed” and “when the determination is performed but the amount of fuel increases. And “when it is determined that it is not”.
In other words, “the determination of the increase in the amount of fuel is not stored in the storage means” means that “the determination of the increase in the amount of fuel itself has not been performed, and thus the determination result of the increase in the amount of fuel itself is stored in the storage means. "When not stored" and "when the determination is made but the determination result that the amount of fuel has not increased is stored in the storage means".

  According to this configuration, it is possible to determine the abnormality of the lid switch based on the amount of fuel in the fuel tank regardless of the operation history of the lid switch.

The control means does not store the determination of the increase in the amount of fuel during the previous activation, and is detected by the fuel amount detection means at the time of the current activation accompanying the turning on of the ignition switch. It is desirable to determine that an abnormality has occurred in the lid switch when the amount of the fuel is greater than the amount of fuel at the end of the previous activation.

  Furthermore, it is preferable that the control means determine an amount that can be reflected in a fuel meter of the vehicle as the predetermined amount.

  According to this configuration, when there is an increase in the amount of fuel that can be determined as having been refueled, it is possible to determine whether the lid switch is abnormal.

  According to the present invention, the accuracy of lid switch abnormality determination can be improved.

It is a block diagram of the evaporative fuel processing apparatus (at the time of airtight holding) which concerns on embodiment of this invention. It is a block diagram which shows ECU which concerns on embodiment of this invention. It is a block diagram of the evaporative fuel processing apparatus which concerns on embodiment of this invention, and has shown the state at the time of refueling. It is a time chart for demonstrating the abnormality determination of the lid switch in the evaporative fuel processing apparatus which concerns on embodiment of this invention, (a) is normal, (b) is a figure which shows the time of abnormality.

  Next, embodiments of the present invention will be described in detail with reference to the drawings as appropriate. In each figure, common portions are denoted by the same reference numerals, and redundant description is omitted.

  In FIG. 1, the block diagram of the evaporative fuel processing apparatus (at the time of airtight holding) 1 which concerns on embodiment of this invention is shown. The fuel vapor processing apparatus 1 is connected to a vapor passage (pipe) 9, a control valve (electromagnetic valve) 11 connected on the vapor passage (pipe) 9, and a vapor passage (pipe) 9 in parallel with the control valve 11. A high-pressure two-way valve 10, a canister 13 to which one end of a vapor passage (pipe) 9 is connected, and a purge having one end connected to the canister 13 and the other end connected to an intake passage (not shown) of the internal combustion engine A passage (pipe) 18, a purge control valve 14 connected on the purge passage (pipe) 18, a pressure sensor 15 for detecting the pressure in the canister 13, and a pressure in the fuel tank 3 (tank pressure Ptank) are detected. Pressure sensor 16 and ECU (Electronic Control Unit) 2. The control valve 11 is a so-called ORVR (Onboard Refueling Vapor Recovery) valve.

  The other end of the vapor passage (pipe) 9 is connected to the fuel tank 3. A filler pipe 4 and a breather pipe 5 are connected to the fuel tank 3. The other end of the breather pipe 5 is connected to the upper part of the filler pipe 4. The opening at the other end of the filler pipe 4 is covered with a filler cap 6.

  The fuel lid 7 is provided at a position where the opening of the filler pipe 4 of the vehicle body (not shown) and the filler cap 6 face, and further covers the filler cap 6. The fuel lid 7 is provided with a fuel lid lock 7a as a lock mechanism, and the fuel lid lock 7a is locked and closed except when refueling. When the lid switch 8 is pushed by the driver or the like, and then the ECU 2 determines that a predetermined condition is satisfied, the ECU 2 releases the lock by the fuel lid lock 7a and automatically opens the fuel lid 7. When the fuel lid 7 is opened, the driver or the like can open the filler cap 6 and supply fuel to the fuel tank 3. Further, the fuel lid 7 can be opened manually by a driver or the like (direct operation of the fuel lid 7 outside the vehicle, operation of a lever capable of releasing the fuel lid lock 7a, etc.).

  The fuel tank 3 has a pump 3 a that sends fuel to an internal combustion engine (not shown), and a float valve 3 b and a cut valve 3 c provided at an opening to a vapor passage (pipe) 9. The float valve 3 b closes the opening to the vapor passage (pipe) 9 when the so-called full tank is reached, and prevents fuel from entering the vapor passage (pipe) 9. The cut valve 3c does not block the opening to the vapor passage (pipe) 9 even when the so-called full tank is reached. However, for example, the fuel tank 3 tilts and the fuel level rises so that the fuel passes through the vapor passage (pipe) 9. To prevent entering.

  The canister 13 can adsorb evaporated fuel generated in the fuel tank 3 that stores fuel. The canister 13 contains activated carbon or the like, and the evaporated fuel is adsorbed by the activated carbon or the like. On the contrary, the canister 13 sucks air from the atmosphere by the intake negative pressure of the internal combustion engine and sends the sucked air to the purge passage (pipe) 18, so that the evaporated fuel adsorbed in the canister 13 is removed from the canister 13. The internal combustion engine can be purged.

  The control valve 11 is provided in a vapor passage 9 that allows the fuel tank 3 and the canister 13 to communicate with each other. As the control valve 11, a normally closed electromagnetic valve can be used. The control valve 11 is normally in a closed state in which the flow of the evaporated fuel is blocked by the valve body urged by the urging means being seated on the valve seat. When the coil is energized by the control valve control means 2b1 (see FIG. 2) of the ECU 2, a magnetic flux is generated in the movable core by the excitation of the coil, and the movable core is attracted to the fixed core by a magnetic force. The valve body attached to the movable core moves against the urging force of the urging means and moves away from the valve seat, and the control valve 11 is in a valve open state that allows the flow of the evaporated fuel.

  The high-pressure two-way valve 10 has a mechanical valve in which a diaphragm positive pressure valve and a negative pressure valve are combined. The positive pressure valve is configured to open when the pressure on the fuel tank 3 side becomes higher by a predetermined pressure than the pressure on the canister 13 side. By this valve opening, the evaporated fuel that has become high pressure in the fuel tank 3 is sent to the canister 13. The negative pressure valve is configured to open when the pressure on the fuel tank 3 side becomes a predetermined pressure lower than the pressure on the canister 13 side. By this opening, the evaporated fuel stored in the canister 13 is returned to the fuel tank 3.

  The purge control valve 14 is provided in a purge passage (pipe) 18. An electromagnetic valve can be used as the purge control valve 14. The purge control valve 14 is controlled to be opened and closed by the ECU 2.

  A piezoelectric element can be used for the pressure sensors 15 and 16. The pressure sensor 15 is connected to the canister 13 and can detect the pressure in the canister 13. Further, since the pressure in the canister 13 is equal to the pressure in the purge passage 18 and the pressure on the canister 13 side relative to the control valve 11 in the vapor passage 9, the pressure sensor 15 substantially has those pressures. Can also be detected. The detected pressure is transmitted to the ECU 2.

  The evaporative fuel processing apparatus 1 also includes a fuel amount detection means 21 that is a sensor that detects the amount of liquid fuel stored in the fuel tank 3 and outputs the detected amount to the ECU 2.

  Next, the ECU 2 will be described with reference to FIG. The ECU 2 is a control means configured by a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read-Only Memory), an input / output circuit, and the like. The ECU 2 acquires an on signal and an off signal output from an ignition switch (hereinafter referred to as an IG switch) 31 of the vehicle, and starts and stops based on the on signal and the off signal. That is, the ECU 2 starts when the IG switch 31 is in an on state and stops when the IG switch 31 is in an off state. Further, even when the IG switch 31 is in the OFF state, the ECU 2 is activated when the opening command output from the lid switch 8 is acquired, and after a predetermined time has elapsed after acquiring the opening command (for example, after 30 minutes) ) To stop.

  As shown in FIG. 2, the ECU 2 includes, as functional blocks, a lock release unit 2a, a control valve control unit 2b, an abnormality determination unit 2c, and a storage unit 2d.

  The unlocking means 2a acquires the opening command output from the lid switch 8, and when the opening command is acquired, outputs the unlocking signal to the fuel lid lock 7a and releases the lock of the fuel lid 7. Further, the lock release means 2a outputs a signal indicating that the opening command has been acquired to the control valve control means 2b.

  The control valve control means 2b controls the drive of the control valve 11, and is in an open state that allows the vapor passage 9 to flow through the evaporated fuel, and a closed state that blocks the flow of the vapor passage 9 through the vaporized fuel, Can be switched.

  A basic configuration of the control method of the fuel lid 7 and the control valve 11 by the ECU 2 will be described. First, when the unlocking means 2a acquires the opening command output from the lid switch 8 by the operation of the driver or the like, the control valve control means 2b performs the opening control of the control valve 11. Subsequently, the unlocking means 2a determines whether or not the pressure in the fuel tank 3 has decreased until it reaches the lid opening permission pressure. If the lid opening permission pressure has been reached, the lock release means 2a outputs a lock release signal to the fuel lid lock 7a to release the lock, and the lid of the fuel lid 7 is opened as shown in FIG. Thereafter, the driver or the like opens the filler cap 6 and refuels. After refueling, the driver closes the filler cap 6 and further closes the lid of the fuel lid 7.

  The abnormality determination unit 2c acquires the amount of fuel detected by the fuel amount detection unit 21 during the activation of the ECU 2, and outputs the fuel amount to the fuel meter 32 of the vehicle to display the fuel amount, and the fuel amount detection unit 21 Whether the lid switch 8 is abnormal is determined based on the amount of fuel detected by the above. In order to reflect the fuel supply to the fuel meter 32, it is a condition that an amount of fuel that can be determined as fuel supply by the fuel amount detection means 21 is supplied into the fuel tank 3. This is to prevent erroneous determination in the abnormality determination of the lid switch 8 due to an error in the fuel amount detection means 21 itself, a change in the fuel amount in the fuel tank 3 accompanying the inclination of the vehicle, and the like.

  More specifically, the abnormality determination unit 2c is activated when the IG switch 31 is off and an open command is output from the lid switch 8, and the IG switch 31 detected by the fuel amount detection unit 21 is off. An increase in the amount of fuel, and the amount of fuel detected by the fuel amount detection means 21 when the IG switch 31 is turned on is acquired, and the increase in the amount of fuel while the IG switch 31 is turned off If the amount of fuel is increased even though there is no such determination, it is determined that an abnormality has occurred in the lid switch 8.

  In the present embodiment, the abnormality determination unit 2c increases the amount of fuel detected by the fuel amount detection unit 21 in a state where the IG switch 31 is off and the start command is output from the lid switch 8. And the amount of fuel at the end of the previous activation is stored in the storage means 2d, there is no determination of the increase in the amount of fuel at the previous activation, and the current activation at the time of the IG switch 31 being turned on When the amount of fuel is increased by a predetermined amount from the amount of fuel at the end of the previous activation, it is determined that an abnormality has occurred in the lid switch 8, and the determination result indicating the abnormality is displayed on the monitor, light emitter, It outputs to the notification means 33 which consists of a speaker etc. and makes a driver | operator notify. The abnormality determination unit 2c does not determine the increase in the amount of fuel during the start-up associated with the turning on of the IG switch 31, and determines the increase in the amount of fuel only during the start-up associated with the operation of the lid switch 8.

In the present invention, the abnormality of the lid switch 8 is a concept including the following four states, for example.
(1) Since a failure occurred in the lid switch 8 and an open command could not be output, the driver or the like manually opened the fuel lid 8 and refueled.
(2) Since the wiring that connects the lid switch 8 and the ECU 2 so as to be communicable is disconnected and the opening command is not input to the ECU 2, the driver or the like manually opens the fuel lid 7 and supplies fuel.
(3) Although the ECU 2 has acquired the opening command but cannot be activated, the driver or the like manually opened the fuel lid 7 and refueled.
(4) Although no failure occurred in the lid switch etc., the driver etc. manually opened the fuel lid 7 and refueled.

In the present invention, “no determination of increase in fuel amount” means “when the determination of increase in fuel amount itself is not performed” and “when the determination is performed but the amount of fuel increases. And “when it is determined that it is not”. In other words, “the determination of the increase in the amount of fuel is not stored in the storage unit 2d” means that “the determination of the increase in the amount of fuel itself is not performed, and therefore the determination result of the increase in the amount of fuel itself is the storage unit. "When not stored in 2d" and "when the determination is made but the determination result that the amount of fuel has not increased is stored in the storage means 2d". Here, the abnormality determination means determines that the amount of fuel has increased when the amount of fuel has increased by a predetermined amount or more, and if the amount of increase in fuel has not reached the predetermined amount, It can be determined that the amount has not increased.

  Hereinafter, the abnormality determination of the lid switch 8 by the abnormality determination unit 2c will be described in the order of normality and abnormality.

<Normal>
As shown in FIG. 4A, when the driver or the like operates the IG switch 31 in the off state with the ECU 2 activated, the ECU 2 stops and the fuel amount detection means 21 stops detecting the amount of fuel. (Time t1). At this time, the abnormality determination unit 2c of the ECU 2 stores the amount of fuel at the time of stop (time t1) in the storage unit 2d and stores in the storage unit 2d that the increase determination of the amount of fuel is not performed.

  Subsequently, when the driver or the like operates the lid switch 8, the ECU 2 in a stopped state is activated based on the opening command, and the fuel amount detection means 21 starts detecting the amount of fuel (time t2). The lock release means 2a of the ECU 2 outputs a lock release signal to the fuel lid lock 7a after satisfying a predetermined condition to release the lock, and opens the lid of the fuel lid 7.

  Thereafter, the driver or the like opens the filler cap 6 to supply fuel, closes the filler cap 6 after refueling, and further closes the lid of the fuel lid 7. At the time of refueling, since the control valve 11 is opened, even if the lid of the fuel lid 7 and the filler cap 6 are opened, the evaporated fuel is prevented from being released into the atmosphere from the opening (fuel filler port) of the filler pipe 4. be able to. Here, the abnormality determination unit 2c performs an increase determination of the fuel amount based on the detection result of the fuel amount detection unit 21, and stores (rewrites) the fact that the increase determination of the fuel amount has been performed in the storage unit 2d. .

  After a predetermined time has elapsed since the start based on the operation of the lid switch 8, the ECU 2 stops and the fuel amount detection means 21 stops detecting the amount of fuel (time t3). At this time, the abnormality determination unit 2c of the ECU 2 rewrites the amount of fuel at the time t1, and stores the amount of fuel at the time of stop (time t3) in the storage unit 2d.

  Thereafter, when the driver or the like operates the IG switch 31 in the ON state, the ECU 2 is activated and the fuel amount detection means 21 starts detecting the amount of fuel (time t4). Here, the abnormality determining means 2c of the ECU 2 refers to the storage means 2d and recognizes that the fuel amount has been determined to increase during the previous activation, and therefore determines that the lid switch 8 is normal.

<In case of abnormality>
On the other hand, as shown in FIG. 4B, when the driver or the like operates the IG switch 31 in the off state with the ECU 2 activated, the ECU 2 stops and the fuel amount detection means 21 detects the amount of fuel. Is stopped (time t1). At this time, the abnormality determination unit 2c of the ECU 2 stores the amount of fuel at the time of stop (time t1) in the storage unit 2d, and stores in the storage unit 2d that the determination of increase in the amount of fuel is not performed.

  Subsequently, the driver or the like operates the lid switch 8, but since the lid switch 8 is out of order, the opening command is not output and the ECU 2 is not activated (time t2). Since the ECU 2 is not activated and the lock release means 2a does not output a lock release signal to the fuel lid lock 7a, the driver or the like manually opens the lid of the fuel lid 7.

  Thereafter, the driver or the like opens the filler cap 6 to supply fuel, closes the filler cap 6 after refueling, and further closes the lid of the fuel lid 7. During such refueling, since the ECU 2 is not activated, the fuel amount increase determination is not performed.

  Thereafter, when the driver or the like operates the IG switch 31, the ECU 2 is activated and the fuel amount detection means 21 starts detecting the amount of fuel (time t4). Here, the abnormality determination means 2c of the ECU 2 refers to the storage means 2d, recognizes that the increase determination of the amount of fuel was not performed during the previous activation, and stored the amount of fuel at the time t1 and the time The presence or absence of abnormality of the lid switch 8 is determined by comparing the amount of fuel at t4. In this determination, since the amount of fuel has increased by a predetermined amount or more and the increase in the amount of fuel at time t4 does not match the stored contents of the storage means 2d, the abnormality determination means 2c is connected to the lid switch 8. It is determined that an abnormality has occurred.

  It should be noted that the abnormality determination means 2c is in a state where the amount of fuel detected by the fuel amount detection means 21 increases when the IG switch 31 is off and the lid switch 8 is operated. The switch 8 may be configured to determine that it is normal. Here, when the abnormality determination unit 2c is activated when the IG switch 31 is off and the lid switch 8 is operated, if the lid switch 8 is determined to be normal, the ECU 2 remains activated (stops). In this case, the determination accuracy can be improved by performing the normal determination in consideration of the increase in the amount of fuel as described above.

The evaporative fuel processing apparatus 1 according to the embodiment of the present invention can determine the abnormality of the lid switch 8 based on the amount of fuel in the fuel tank 3 regardless of the operation history of the lid switch 8. The accuracy of the abnormality determination of 8 can be improved.
In addition, the evaporated fuel processing apparatus 1 according to the embodiment of the present invention can prevent erroneous determination due to the detection error of the amount of fuel due to vehicle inclination or the like.
Further, the evaporated fuel processing apparatus 1 according to the embodiment of the present invention can perform an abnormality determination of the lid switch 8 when there is an increase in the amount of fuel that can be determined to have been refueled.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment, A design change is possible suitably in the range which does not deviate from the summary of this invention. For example, the lock release means 2a may not be configured to transfer the open command to the control valve control means 2b, but may be configured such that both the lock release means 2a and the control valve control means 2b acquire the open command. The evaporative fuel processing apparatus 1 further includes detection means (sensor) for detecting the open / closed state of the fuel lid 7, and the ECU 2 detects the detection means before a predetermined time elapses when the lid switch 8 is activated. May be configured to stop when the closed state of the fuel lid 7 is detected. In addition, the abnormality determination means 2c indicates that “there is no determination of the increase in the amount of fuel” that “the determination of the increase in the amount of fuel is not performed” only when “the increase in the amount of fuel is not determined” It may be configured as

  Further, as the control valve 11, a ball valve can be used instead of the normally closed electromagnetic valve. The ball valve is fully closed when the opening is zero degrees and fully opened when the opening is 90 degrees. The opening degree of the control valve (ball valve) 11 can be detected by an opening degree detecting means (not shown), and the detected opening degree is transmitted to the ECU 2. Further, the control valve control means 2c of the ECU 2 can perform an open control for opening the control valve 11 and a close control for closing, and also variably controls the speed at which the control valve 11 is opened or closed, or opens the control valve 11. The opening degree at the time can be adjusted. That is, the ball valve as the control valve 11 is a valve capable of linearly controlling the opening / closing speed and the opening degree.

  Further, a three-way valve is further provided, one of the three-way valves is connected to the pressure sensor 16, and the remaining two ports of the three-way valve are on the side of the canister 13 with respect to the control valve 11 of the vapor passage 9 and the control valve of the vapor passage 9 11 may be connected to the fuel tank 3 side. The ECU 2 controls the three-way valve to connect the pressure sensor 16 and the control valve 11 of the vapor passage 9 to the canister 13 side, or to connect the pressure sensor 16 and the control passage 11 of the vapor passage 9 to the fuel tank 3 side. can do. If the pressure sensor 16 is connected to the canister 13 side of the vapor passage 9 relative to the control valve 11, the pressure sensor 16 will adjust the pressure on the canister 13 side relative to the control valve 11 in the vapor passage 9, and further the pressure inside the canister 13. Can be detected. Since the pressure detected at this time should coincide with the pressure detected by the pressure sensor 15, the pressure sensor 15 and 16 can be calibrated and diagnosed. If the three-way valve is controlled so that the pressure sensor 16 and the fuel tank 3 side are connected to the vapor passage 9 than the control valve 11, the pressure sensor 16 is connected to the fuel tank 3 side pressure relative to the control valve 11 in the vapor passage 9. Furthermore, the pressure in the fuel tank 3 (tank pressure Ptank) can be detected. The pressure sensor 16 transmits the detected pressure to the ECU 2.

DESCRIPTION OF SYMBOLS 1 Evaporated fuel processing apparatus 2 ECU (control means)
2c Abnormality determination means 3 Fuel tank 7 Fuel lid 7a Fuel lid lock 8 Lid switch 21 Fuel amount detection means 32 Fuel meter

Claims (3)

A fuel vapor processing apparatus for a vehicle,
A fuel tank for storing fuel;
A canister that adsorbs evaporated fuel generated in the fuel tank;
A filler pipe that communicates with the fuel tank and into which fuel is introduced from an opening when refueling;
A fuel lid provided on the vehicle body and covering the opening;
A lid switch that outputs an open command for opening the fuel lid;
Fuel amount detection means for detecting the amount of the fuel in the fuel tank;
Control means that starts when the ignition switch of the vehicle is on and stops when the ignition switch is off;
With
The control means includes
When the ignition switch is turned off, the amount of fuel detected by the fuel amount detection unit at that time is stored in the storage unit, and the fact that the increase determination of the amount of fuel is not performed is stored in the storage unit. Stop after memorizing means,
After that, when the ignition switch is off and the opening command is output from the lid switch, it is activated to detect an increase in the amount of the fuel while the ignition switch detected by the fuel amount detecting means is off. And determining that the fuel amount increase determination has been performed in the storage means,
Further, the amount of the fuel detected by the fuel amount detecting means when the ignition switch is turned on is acquired, and the determination of the increase in the amount of fuel while the ignition switch is turned off is stored in the storage means. If the fuel amount has increased by a predetermined amount or more compared to the amount of fuel when the ignition switch is turned off, it is determined that an abnormality has occurred in the lid switch. The evaporative fuel processing apparatus characterized by the above-mentioned. The control means does not store the determination of the increase in the amount of fuel during the previous activation, and is detected by the fuel amount detection means at the time of the current activation accompanying the turning on of the ignition switch. 2. The evaporated fuel according to claim 1, wherein when the amount of the fuel increases more than the amount of the fuel at the end of the previous activation, it is determined that an abnormality has occurred in the lid switch. Treatment device. The evaporative fuel treatment device according to claim 1, wherein the control unit determines an amount that can be reflected in a fuel meter of the vehicle as the predetermined amount.

Images